Issue: SPR-13794

This commit introduces 'before' and 'after' test execution callbacks in
the Spring TestContext Framework. Specifically, this set of commits
introduces the following.

- beforeTestExecution() and afterTestExecution() callbacks in the
  TestExecutionListener API

- beforeTestExecution() and afterTestExecution() callbacks in
  TestContextManager

- RunBeforeTestExecutionCallbacks and RunAfterTestExecutionCallbacks
  JUnit 4 statements that are used by the SpringJUnit4ClassRunner

- Documentation in the class-level Javadoc for SpringMethodRule stating
  that before/after test execution callbacks cannot be supported with
  JUnit 4 Rules

- Support for JUnit Jupiter's BeforeTestExecutionCallback and
  AfterTestExecutionCallback extension APIs in the SpringExtension for
  JUnit 5

- Support for before/after test execution callbacks in
  AbstractTestNGSpringContextTests for TestNG

Issue: SPR-4365

Issue: SPR-4365

Issue: SPR-4365

Issue: SPR-4365

Issue: SPR-4365

Issue: SPR-4365

This commit fixes the method that takes a Callable to actually always
invoke it rather than returning null.

Issue: SPR-14445

This commit fixes a minor bug introduced in 0adc4921.

Issue: SPR-14447

Issue: SPR-14430

Issue: SPR-14432

Issue: SPR-13188

Issue: SPR-14432

Issue: SPR-13794

Issue: SPR-14436

Issue: SPR-13188

Issue: SPR-14427

This commit removes `GuavaCache` and support classes. Caffeine supersedes
the caching support in the Google Guava library with an actively maintained
Java 8+ version in standalone form.

As it is the only Guava feature Spring framework integrates with, this
commit removes effectively any reference to Guava.

Issue: SPR-13797

SPR-14055 introduced first-class support for the Java 8 Parameter API.

This commit therefore replaces the MethodParameterFactory with use of
the new SynthesizingMethodParameter.forParameter(Parameter) factory
method.

Issue: SPR-13575

Issue: SPR-13575

* pr/1100:
  Remove trailing whitespaces
  Add the injection point for the Provider

Closes gh-1100

See gh-1100

Issue: SPR-13188

Also, equals insists on the same class now, differentiating from SynthesizingMethodParameter.

Issue: SPR-14055
Issue: SPR-13456
Issue: SPR-14438

Issue: SPR-14425

Issue: SPR-14433

Issue: SPR-14432

Issue: SPR-14432

* pr/1099:
  Polish doc

Closes gh-1099

Issue: SPR-13294