Closes gh-11655

* pr/11624:
  Polish "Fix potential resource leaks"
  Fix potential resource leaks

Closes gh-11624

See gh-11624

* pr/11648:
  Fix a wrong import for SocketChannel

Closes gh-11648

* pr/11649:
  Upgrade to JUnit Jupiter 5.0.3

Closes gh-11649

This commit makes sure that the `type` of a property is generated
property if the getter of the property is annotated. Previously, a type
implementation may expose the annotation information.

Closes gh-11512

This commit removes the use of the incubating PropertyState and
Provider API that was introduced in Gradle 4.0 and deprecated in
Gradle 4.3. A not-deprecated-but-still-incubating replacement was
introduced in Gradle 4.3. The short life of PropertyState and Provider
has made me wary of using an incubating Gradle API in our public API
as it may not be stable for long. Therefore, this commit does not move
to the replacement as it is incubating. Instead, it falls back to
using Gradle's convention mapping. This is internal API, but its use
is not part of our public API and I perceive the risk of using it to
be lower than using the deprecated and/or incubating API alternatives.

Closes gh-11640

Closes gh-11654

Closes gh-11059

Improve the structure of the response and include mappings from
WebFlux and Servlet and Filter registrations in addition to the
mappings from Spring MVC.

Closes gh-9979

This commit uses HTML escaping to sanitize error inputs that are
displayed in the default reactive HTML error view.

Fixes gh-11582

This commit adds support for HTTP compression with reactive servers,
with the following exceptions:

* `server.compression.mime-types` and
`server.compression.exclude-user-agents` are not supported by Reactor
Netty at the moment

* `server.compression.min-response-size` is only supported by Reactor
Netty right now, since other implementations rely on the
`"Content-Length"` HTTP response header to measure the response size
and most reactive responses are using `"Transfer-Encoding: chunked"`.

Closes gh-10782

Closes gh-11641

This commit moves "spring.mvc.media-types" to the
"spring.mvc.content-negotiation.*" namespaces introduced in gh-11105.

Closes gh-11636

The behaviour was changed in 2b99962a. This commit updates the
javadoc to hopefully clarify that Instant.isAfter(Instant) is used.

Closes gh-11612

This commit improves a class condition check on the actual
implementation rather than the general purpose interface.

Closes gh-11608

Previously, a number of Actuator endpoints ignored a context hierarchy
or assumed that it would always be linear. This commit reworks the
affected endpoints so that the no longer assume a linear hierarchy.

A side-effect of a non-linear hierarchy is that there may be multiple
different beans with the same name (in a linear hierarchy, a bean
with the same name as one in an ancestor context, replaces that bean).
The affected endpoints have also been updated so that, when bean names
are used as keys, those keys are grouped by application context. This
prevents a bean in one context from accidentially overwriting a bean
in another context.

Closes gh-11019

* pr/11604:
  Improve Kotlin extensions doc about type erasure

Since type erasure can be fixed only when using
ParameterizedTypeReference based Java methods, TestRestTemplate
API documentation should be updated to specify which extensions
are subject to type erasure, and which are not.

Closes gh-11604

Closes gh-11511

* pr/11638:
  Polish Kafka documentation

Closes gh-11638

Closes gh-11589

Closes gh-11635

Closes gh-11529

Closes gh-10976

This commit disables by default suffix pattern matching in Spring MVC
applications. As described in the Spring MVC documentation (see
https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-ann-requestmapping-suffix-pattern-match),
this is considered as best practice.

This change also introduces new configuration properties to achieve
similar results in a safer way (using query parameters) or to rollback
to the former default.

Closes gh-11105

Closes gh-10923