Update the `EndpointId` constraints to allow '.' in names.

Closes gh-14773

Closes gh-13195

Closes gh-13832

Closes gh-14727

Closes gh-14721

Previously, Couchbase's health was determined by retrieving the bucket info
from the cluster info. This retrieval could take over one minute in some
cases even when Couchbase is health. This latency is too large for a health
check.

The Couchbase team have recommended the of a Cluster#diagnostics instead.
This provides a much lower latency view of the cluster's health. This
commit updates CouchbaseHealthIndicator to use Cluster#diagnostics while
retaining support, in a deprecated form, for the old info-based mechanism
should anyone want to opt back into that in 2.0.x.

Closes gh-14685

Closes gh-14728

Closes gh-14828

Closes gh-14829

Closes gh-14722

Closes gh-14826

* pr/14822:
  Fix typo in EndpointIdTests

Closes gh-14822

Closes gh-14808

Closes gh-14773

Update `MappingWebEndpointPathMapper` to use the lowercase version of
the endpoint ID when no explicit path mapping has been set. An endpoint
with the ID 'myEndpoint' will now be mapped to the path 'myendpoint'.

See gh-14773

Update `ExposeExcludePropertyEndpointFilter` so that mixed case
endpoint IDs are supported. Prior to this commit it was not easy for
an endpoint to be missed by the filter due to the formatting of the
property value.

See gh-14773

Update `OnEnabledEndpointCondition` so that mixed case endpoint IDs
are supported. Prior to this commit an
`InvalidConfigurationPropertyNameException` would be thrown when trying
to enabled or disable an endpoint with a camel case ID.

See gh-14773

Update the endpoint time-to-live binding logic so that mixed case
endpoint IDs are supported. Prior to this commit an
`InvalidConfigurationPropertyNameException` would be thrown when using
a camel case endpoint ID.

See gh-14773

Add an `EndpointID` class to enforce the naming rules that we support
for actuator endpoints. We now ensure that all endpoint names contain
only letters and numbers and must begin with a lower-case letter.

Existing public classes and interfaces have been changes so that String
based `endpointId` methods are deprecated and strongly typed versions
are preferred instead. A few public classes that we're not expecting
to be used directly have been changed without deprecated methods being
introduced.

See gh-14773

See gh-14808

Closes gh-14444

* pr/14744:
  Polish "Add support for @ResponseStatus in DefaultErrorAttributes"
  Add support for @ResponseStatus in DefaultErrorAttributes

Closes gh-14744

This commit adds support for @ResponseStatus in DefaultErrorAttributes
mimicking the semantics of @ResponseStatus in SpringMVC.

Throwables annotated with @ResponseStatus handled by
DefaultErrorAttributes will result in the following error attributes:
* 'status' set as the return value of the HttpStatus#value()
  defined as @ResponseStatus#value()
* 'error' set to the default reason phrase of the HttpStatus
  defined as @ResponseStatus#value()
* 'message' defined as the value of @ResponseStatus#reason(),
  or the default HttpStatus's reason phrase if left unspecified

See gh-14744

Closes gh-14797

Closes gh-14787

Ensure that if the user has set `failCtxIfServletStartFails` to `true`
using a `ContextCustomizers` any Servlet init exceptions stop the
application from running.

Closes gh-14448

Closes gh-14447

Update the reference documentation with a warning about the `webDriver`
scope that we create.

Closes gh-13093

Update the reference documentation with a section about encrypting
properties and a link to Spring Cloud Vault.

Closes gh-13618

Update the reference documentation to suggest that devtools uses a
custom `developmentOnly` scope, rather than `compileOnly`.

Closes gh-14451

* pr/14497:
  Polish "Stop MetricsEndpoint from summing up same metrics"
  Stop MetricsEndpoint from summing up same metrics

See gh-14497

Update `MetricsEndpoint` so that only the first matching meter is used
when calculating the sum of of statistics.

Prior this this commit the endpoint would consider all Meters. This
caused incorrect statistics when multiple back-end systems were being
used since the registries contained in the `CompositeMeterRegistry`
would be  iterated, and the same effective metric would be counted more
than once.

Closes gh-14497