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

Issue: SPR-12939

Since the ContextCache is now a published SPI, it and its collaborators
have been moved to a dedicated 'org.sfw.test.context.cache' subpackage.

Issue: SPR-12683

This is a rework of fd7153ff that also now clears the reference to the
BeanFactory when the context is disposed.

Issue: SPR-12518

Issue: SPR-12597

If a custom MessageConverter is set, it is not used for replies defined
via the Message abstraction. This commit harmonizes the behaviour of the
`MessagingMessageConverter` so that the conversion of the payload can
be converted for both incoming and outgoing messages.

Issue: SPR-12912

Previously, a custom `DestinationResolver` was not made available
to the underlying `MessageListener`: if a reply needs to be sent, the
default `DestinationResolver` was used.

This commit ensures that if a custom `DestinationResolver` has been set,
it is also configured accordingly for replies.

Issue: SPR-12927

Issue: SPR-12931

This commit adds an assertion to DefaultTestContext's
getApplicationContext() method to ensure that a context loaded by the
Spring TestContext Framework (TCF) or retrieved from the ContextCache
is still active. This extra check helps to avoid situations where
developers manually close a cached context instead of relying on the
@DirtiesContext support.

Issue: SPR-12932

The changes made in 0cb22fc8 would
result in contexts not being properly closed if evicted from the
ConcurrentReferenceHashMap by the Garbage Collector.

This commit reverts those changes and returns to using standard
ConcurrentHashMaps for the time being.

Issue: SPR-7687

Issue: SPR-12683

Improve extensibility of TestContext bootstrapping & context caching

These commits include numerous refactorings and enhancements to the
bootstrapping and context caching mechanisms in the Spring TestContext
Framework.

Issue: SPR-12683

 - DefaultBootstrapContext and DefaultCacheAwareContextLoaderDelegate
   are now public classes in the 'support' subpackage.

 - Introduced getCacheAwareContextLoaderDelegate() in
   AbstractTestContextBootstrapper as an extension point for configuring
   custom ContextCache support.

 - Introduced reflection-based createBootstrapContext() utility method
   in BootstrapUtils; TestContextManager now delegates to BootstrapUtils
   in order to avoid package cycles.

 - Introduced logStatistics() method in the ContextCache API and defined
   statistics logging category as a constant.

 - DefaultCacheAwareContextLoaderDelegate now delegates to
   ContextCache.logStatistics().

Issue: SPR-12683

 - ContextCache is now a public interface.

 - Introduced public DefaultContextCache implementation in the 'support'
   subpackage.

Issue: SPR-12683

Issue: SPR-12683

This commit moves the responsibility of building a TestContext from the
TestContextManager to a TestContextBootstrapper.

In addition, DefaultTestContext is now a public class residing in the
"support" subpackage.

Issue: SPR-12683

Issue: SPR-12683

Prior to this commit, the ContextCache in the Spring TestContext
Framework (TCF) cached ApplicationContexts in a ConcurrentHashMap using
strong references. This practice can occasionally lead to
OutOfMemoryErrors when running a large number of tests in a test suite
with varying context configuration since the context cache becomes
overpopulated over time.

This commit addresses this issue by using Spring's
ConcurrentReferenceHashMap which uses SoftReferences for both the keys
(i.e., MergedContextConfiguration instances) and values (i.e.,
ApplicationContexts) stored in the map that backs the ContextCache.

Issue: SPR-7687

This change adds support for broadcasting messages with unresolved
user destinations so that other servers can try to resolve it.
That enables sending messages to users who may be connected to a
different server.

Issue: SPR-11620

Issue: SPR-11620

Prior to this commit, ClassLevelDirtiesContextTests existed for
verifying the expected behavior of @DirtiesContext declared at the
class level in conjunction with JUnit and SpringJUnit4ClassRunner.

This commit introduces analogous tests for TestNG in the new
ClassLevelDirtiesContextTestNGTests class.

Furthermore, ContextCacheTestUtils and TrackingTestNGTestListener have
been introduced to reduce code duplication across the test suite.

Issue: SPR-12918

Issue: SPR-11841

Issue: SPR-12890

Issue: SPR-12925

The attributes of @JmsListener allows to specify the reference to a key
in the Environment but @SendTo did not.

This commit fixes this inconsistency so that response destinations are
now also externally configurable.

Issue: SPR-12899

AbstractApplicationContext collects early ApplicationEvents and publishes them once the multicaster is available

Issue: SPR-12902

Issue: SPR-12900