Issue: SPR-15367

Enhance FixedContentNegotiationStrategy and places where it is exposed
to also accept a list of media types.

Issue: SPR-15367

This commit introduces an explicit dependency on the latest JUnit
Platform Launcher API so that it overrides whatever is bundled by
default in IntelliJ IDEA.

This allows a more seamless upgrade to newer versions of JUnit 5 and
the JUnit Platform before IDEA has been officially updated to support
those versions.

Issue: SPR-14512

Issue: SPR-15434

Issue: SPR-14925

Issue: SPR-15225

Issue: SPR-15209

Issue: SPR-14925

Plus first-class declaration of FileNotFoundException in Resource javadoc.

Issue: SPR-15433

Issue: SPR-15430

This commit changes the `HandlerStrategies` builder to use
`ServerCodecConfigurer` for configuring Decoder|Encoder and
HttpMessage[Reader|Writer]. Note that the configurer is not exposed
directly, but wrapped so that `HandlerStrategies` can keep on returning
`this` for a proper builder pattern.

This commit also removes the HandlerStrategies methods that take an
application context, as it was too naive approach to simply look up
every message reader and writer in the context.

Issue: SPR-15415

- Renamed `defaultCodec` to `defaultCodecs`, and `customCodec` to
`customCodecs`
- Added `@Override` annotations where necessary
- Fixed non-parameterized usage for parameterized types.

Issue: SPR-15430

Issue: SPR-15429

This commit enables the `-use` javadoc flag so that class usage pages
are included in the generated JavaDoc.

Issue: SPR-15427

Issue: SPR-15225

Issue: SPR-15181

Issue: SPR-15383

Previously a requestURI that contained ';' would have the value incorrectly stripped out when using
ForwardedHeaderFilter.

This commit ensures that the ';' is preserved when using ForwardedHeaderFilter.

Issue: SPR-15428

Group all contextPath tests together

Add a test to verify that the ForwardedHeaderFilter contextPath override preserves URL encoding
as it should.

Issue SPR-15422

Previously ForwardedHeaderFilter would override the requestURI with a URL decoded value. This would cause
problems when using a URL encoded requestURI since downstream Filters would not see the URL encoded
value as they should.

This commit resolves this issue by ensuring that the requestURI is properly encoded.

Issues SPR-15422

This commit makes CodecException handling consistent between functional
and annotation-based APIs. It now returns by default 4xx status code
for decoding error and 5xx for encoding error + print the error reason
in logs without the full stack trace in both variants.

Issue: SPR-15355

Issue: SPR-14923

Generic type resolution algorithm in GenericTypeResolver shared between Jackson and Gson.

Issue: SPR-15381

Issue: SPR-15426

* pr/1383:
  Fix typo

Closes gh-1383

* pr/1382:
  Update copyright header
  Fix typo in AfterReturningAdviceInterceptor JavaDoc

Closes gh-1382

See gh-1382

Issue: SPR-15227