This commit picks up where SPR-11483 left off, with the goal of
eliminating all unnecessary inspection of core JDK annotations in
Spring's annotation search algorithms in AnnotatedElementUtils and
AnnotationMetadataReadingVisitor.

Issue: SPR-12989

 - Methods which search for a specific annotation now properly ensure
   that the sought annotation was actually found.

 - Both the "get" and the "find" search algorithms no longer needlessly
   traverse meta-annotation hierarchies twice.

 - Both the "get" and the "find" search algorithms now properly
   increment the metaDepth when recursively searching within the
   meta-annotation hierarchy.

 - Redesigned getMetaAnnotationTypes() so that it doesn't needlessly
   search irrelevant annotations.

 - Documented and tested hasMetaAnnotationTypes().

 - Documented isAnnotated().

Issue: SPR-11514

Issue: SPR-11514

This commit documents the status quo for the getMetaAnnotationTypes()
method in AnnotatedElementUtils and adds appropriate regression tests to
AnnotatedElementUtilsTests.

In addition, this commit also introduces a SimpleAnnotationProcessor
base class in AnnotatedElementUtils.

Issue: SPR-11514

This commit documents return values throughout AnnotatedElementUtils and
improves the documentation for the internal Processor API.

Issue: SPR-11514

Issue: SPR-12738

This commit consistently documents the 'element' and 'annotationType'
method arguments throughout AnnotatedElementUtils.

In addition, this commit introduces assertions against preconditions
for all 'element' and 'annotationType' method arguments.

Issue: SPR-11514

Issue: SPR-12928

Issue: SPR-12599

This commit introduces support for finding annotations on abstract,
bridge, and interface methods in AnnotatedElementUtils.

 - Introduced dedicated findAnnotationAttributes() methods in
   AnnotatedElementUtils that provide first-class support for
   processing methods, class hierarchies, interfaces, bridge methods,
   etc.

 - Introduced find/get search algorithm dichotomy in
   AnnotatedElementUtils which is visible in the public API as well as
   in the internal implementation. This was necessary in order to
   maintain backwards compatibility with the existing API (even though
   it was undocumented).

 - Reverted all recent changes made to the "get semantics" search
   algorithm in AnnotatedElementUtils in order to ensure backwards
   compatibility, and reverted recent changes to
   JtaTransactionAnnotationParser and SpringTransactionAnnotationParser
   accordingly.

 - Documented internal AnnotatedElementUtils.Processor<T> interface.

 - Enabled failing tests and introduced
   findAnnotationAttributesFromBridgeMethod() test in
   AnnotatedElementUtilsTests.

 - Refactored ApplicationListenerMethodAdapter.getCondition() and
   enabled failing test in TransactionalEventListenerTests.

 - AnnotationUtils.isInterfaceWithAnnotatedMethods() is now package
   private.

Issue: SPR-12738, SPR-11514, SPR-11598

This commit introduces support in AnnotatedElementUtils for finding
annotations declared on interfaces at the type level.

NB: this commit does not include support for finding annotations
declared on interface methods.

In order to maintain backward compatibility with @Transactional
annotation attribute processing, a new getAnnotationAttributes() method
has been added to AnnotatedElementUtils that provides a flag to control
whether interfaces should be searched.
SpringTransactionAnnotationParser and JtaTransactionAnnotationParser
have been updated accordingly to ensure that interfaces are not
unintentionally searched in the @Transactional resolution process.

This commit also introduces additional tests and updates TODOs for
SPR-12738.

Issue: SPR-12944, SPR-12738

Prior to this commit, the search algorithm used by the
findAnnotation(Method, Class) method in AnnotationUtils only found
direct annotations or direct meta-annotations (i.e., one level of
meta-annotations).

This commit reworks the search algorithm so that it supports arbitrary
levels of meta-annotations on methods. To make this possible, a new
findAnnotation(AnnotatedElement, Class) method has been introduced in
AnnotationUtils.

This fix also allows for the @Ignore'd tests in
TransactionalEventListenerTests to be re-enabled.

Issue: SPR-12941

Issue: SPR-12940

This commit introduces isNotEmpty() aliases for the existing hasLength()
methods in StringUtils.

Issue: SPR-12909

RuntimeExceptions thrown from FutureAdapter.adapt() should be wrapped in
an ExecutionException, not thrown as is.

Issue: SPR-12887

Also refines logIntrospectionFailure to just log at debug level for meta-annotation introspection failures.

Issue: SPR-12889

ReaderEditor supports Reader injection analogous to InputStreamEditor (from Spring resource location)

Also, EncodedResource implements InputStreamSource now since it declares getInputStream() anyway.

Issue: SPR-12876

AnnotationUtils.getAnnotationAttributes makes Method accessible (analogous to AnnotationUtils.getValue)

Issue: SPR-12858

- The exception message now mentions lacking to-Object method as well.

- Documented explicit lacking support for toString() for conversions.

- Introduced dedicated has*() methods for greater clarity and to reduce
  code duplication.

- Static factory methods (i.e., of, from, valueOf) are now supported for
  conversion to a String.

- Now correctly using @test(expected=...) where appropriate.

- Renamed DefaultConversionTests to DefaultConversionServiceTests.

- Moved all tests related to DefaultConversionService from
  GenericConversionServiceTests to DefaultConversionServiceTests.

- No longer printing to System.out.

- Removed all duplicate instantiation of conversion services.

- Now using Java 8 streams to simplify implementations of custom test
  converters. Also using streams in tests where appropriate.

Issue: SPR-12846

This commit introduces support for HTTP byte ranges in the
ResourceHttpRequestHandler. This support consists of a number of
changes:

- Parsing of HTTP Range headers in HttpHeaders, using a new HttpRange
  class and inner ByteRange/SuffixByteRange subclasses.
- MIME boundary generation moved from FormHttpMessageConverter to
  MimeTypeUtils.
- writePartialContent() method introduced in ResourceHttpRequestHandler,
  handling the byte range logic
- Additional partial content tests added to
  ResourceHttpRequestHandlerTests.

Issue: SPR-10805