This commit updates the initial proposal to add support for reactive
use cases as well. A reactive application can use
ReactiveHealthIndicatorRegistry as an alternative to
HealthIndicatorRegistry.

Closes gh-4965

See gh-4965
Co-authored-by: Andy Wilkinson <awilkinson@pivotal.io>

This commit introduces HealthIndicatorRegistry which handles
registration of HealthIndicator instances. Registering new
HealthIndicator instances is now possible in runtime.

See gh-4965

* pr/13175:
  Polish "Respect lombok.AccessLevel attributes"
  Respect lombok.AccessLevel attributes

Closes gh-13175

Closes gh-13185

Closes gh-13185

See gh-13175

* pr/13174:
  Polish DefaultErrorWebExceptionHandler.renderErrorView()

Closes gh-13174

Closes gh-13182

Closes gh-13181

Closes gh-13178

Closes gh-13177

See gh-13169

Closes gh-13180

Closes gh-13179

* pr/13171:
  Remove @Deprecated on CouchbaseProperties.Endpoints.setKeyValue()

Closes gh-13171

* pr/11061:
  Polish "Allow repackage maven goal to take a source classifier"
  Allow repackage maven goal to take a source classifier

Closes gh-11061

Previously, the "classifier" attribute was only used to determine the
target classifier of the repackaged archive, always using the main
artifact as the source.

This commit changes the semantic of the attribute so that an existing
archive matching the "classifier" attribute can be used as source,
replacing the archive the same way the goal replaces the main archive
if no classifier is found.

If no artifact with the specified classifier exists, the repackaged
archive is still processed based on the main archive and attached to
the lifecycle using the value of the classifier attribute.

See gh-11061

Closes gh-12995

Closes gh-13167

Previously, when the embedded Undertow container was stopped, the
servlet deployment was stopped but it was not undeployed. This meant
that contextDestroyed() callback of any registered
ServletContextListeners was not called.

This commit updates UndertowEmbeddedServletContainer to call undeploy
on the deployment manager in addition to the existing call to stop.
Undeploying the servlet deployment calls Undertow to drive the
contextDestroyed callback on any registered ServletContextListeners.

Closes gh-13134

* gh-12071:
  Polish "Suppress debug log output during Logback initialization"
  Suppress debug log output during Logback initialization