See gh-16544

Update `@JsonComponent` so that it can also be used to register key
serializers and deserializers.

See gh-16544

* pr/16987:
  Polish "Avoid using deprecated NCSARequestLog"
  Avoid using deprecated NCSARequestLog

Closes gh-16987

See gh-16987

See gh-16987

* pr/17044:
  Polish "Fix typo in javadoc"
  Fix typo in javadoc

Closes gh-17044

See gh-17044

See gh-17044

* pr/16671:
  Polish defaultElementEquals
  Polish dashIgnoringElementEquals()

Closes gh-16671

See gh-16671

See gh-16671

* pr/17040:
  Polish "Replace anonymous class with lambdas"
  Replace anonymous class with lambdas

Closes gh-17040

See gh-17040

See gh-17040

* pr/17010:
  Polish "Use request factory to support Basic Authentication"
  Use request factory to support Basic Authentication

Closes gh-17010

Reduce the surface area of the public API by making the
`BasicAuthentication` and `BasicAuthenticationClientHttpRequestFactory`
class package private.

This commit also attempts to simplify `TestRestTemplate` by keeping
the `RestTemplateBuilder` and reusing it, rather than needing to deal
only with a `RestTemplate` instance.

See gh-17010

Update `RestTemplateBuilder` to use a custom request factory to add
authentication headers rather than an interceptor.

Prior to this commit, the use of the `BasicAuthenticationInterceptor`
interceptor could cause `OutOfMemoryError` whenever a large file is
uploaded.

See gh-17010

Simplify `ClientHttpConnectorConfiguration`by using the recently
introduced `JettyClientHttpConnector` constructor.

See gh-17015

Closes gh-17029

Split the JUnit 5 `OutputCapture` class into separate `OutputExtension`
and `CapturedOutput` classes. The JUnit 5 callback methods are now
contained only in the `OutputExtension` class so no longer pollute the
public API that users will interact with.

The `CapturedOutput` class has also been updated to capture System.err
and System.out separately to allow distinct assertions if required.

Closes gh-17029

Refactor `Autotime` from a properties object to an interface and
change the existing metric recording implementations. The `AutoTimer`
interface is a general purpose callback that can be applied to a
`Timer.Builder` to configure it. Autotime properties are now located
in `spring-boot-actuator-autoconfigure` and have become an
implementation of the interface.

Closes gh-17026

* pr/17004:
  Polish CassandraDataAutoConfiguration

Closes gh-17004

See gh-17004

Closes gh-17019

Closes gh-16949

Closes gh-17018

Update `SpringIterableConfigurationPropertySource` so that they cache
and cache key are not stored in different fields. Prior to this commit
it was possible that the an incorrect cache could be returned from
because the key and cache were out of sync.

This commit also allows more lenient handling of ConcurrentModification
exceptions if they are thrown during cache retrieval.

Closes gh-17017
See gh-17013

* pr/17012:
  Add missing @Test annotation

Closes gh-17012

See gh-17012

Closes gh-17016

* pr/17005:
  Handle all getters first in JavaBeanBinder

Closes gh-17005

Update `JavaBeanBinder.addProperties` to add both `get` and `is` methods
before `set`.

See gh-17005

Closes gh-17006

* gh-17002:
  Add a missing @Test in JavaBeanBinderTests

Closes gh-17002