Closes gh-20549

* pr/20541:
  Use @Configuration(proxyBeanMethods=false) wherever possible

Closes gh-20541

The upgrade to the Couchbase SDK v3 changed how errors are reported
when the cluster is not available. This commit updates the check to
look for the new exception in the hope a more solid check can be found
shortly.

See gh-20541

This commit expands the `spring.couchbase.env.timeouts` configuration
namespace with timeouts for disconnect, key-value operations with a
durability level, search, analytics and management.

Closes gh-19893
Co-authored-by: Michael Nitschinger <michael@nitschinger.at>

This commit upgrades to the Couchbase SDK v3 which brings the following
breaking changes:

* Bootstrap hosts have been replaced by a connection string and the
authentication is now mandatory.
* A `Bucket` is no longer auto-configured. The
`spring.couchbase.bucket.*` properties have been removed
* `ClusterInfo` no longer exists and has been replaced by a dedicated
API on `Cluster`.
* `CouchbaseEnvironment` no longer exist in favour of
`ClusterEnvironment`, the customizer has been renamed accordingly.
* The bootstrap-related properties have been removed. Users requiring
custom ports should supply the seed nodes and initialize a Cluster
themselves.
* The endpoints-related configuration has been consolidated in a
single IO configuration.

The Spring Data Couchbase provides an integration with the new SDK. This
leads to the following changes:

* A convenient `CouchbaseClientFactory` is auto-configured.
* Repositories are configured against a bucket and a scope. Those can
be set via configuration in `spring.data.couchbase.*`.
* The default consistency property has been removed in favour of a more
flexible annotation on the repository query methods instead. You can now
specify different query consistency on a per method basis.
* The `CacheManager` implementation is provided, as do other stores for
consistency so a dependency on `couchbase-spring-cache` is no longer
required.

See gh-19893
Co-authored-by: Michael Nitschinger <michael@nitschinger.at>

This commit configures Spring Data Couchbase explicitly rather than
relying on the abstract configuration class. This has the advantage of
simplifying the auto-configuration and let it us proxy-free
configuration classes.

Spring Boot no longer uses or interacts with CouchbaseConfigurer. Users
relying on that to teach Spring Boot which components to use should
rely on `@Primary` flag instead in case of multiple beans of the same
type.

`CouchbaseConfiguration` is no longer public as extending from it is
no longer necessary. If the `CouchbaseEnvironment` has to be
customized, a `CouchbaseEnvironmentBuilderCustomizer` bean can be
registered to tune the auto-configured environment.

Closes gh-20533

Closes gh-20544

Closes gh-20543

Fixes gh-20531

Closes gh-20516

Closes gh-20526

Register Boot Gradle tasks instead of creating them so they can be
loaded lazily.

Closes gh-18881

This commit adds configuration to the Spring Boot Gradle plugin that
allows the names and contents of layers to be customized in the build
configuration.

Fixes gh-20296

Maven's war plugin does not support reproducible builds, resulting in
the entries in the war file not being written in a consistent order
from build to build.

Closes gh-20176

Closes gh-20176

* pr/20527:
  Fix some deprecation warnings

Closes gh-20527

See gh-20527

* gh-20525:
  Fix method order checkstyle issue

Closes gh-20525

See gh-20525

Previously, any HTTP request to an endpoint that included a principal
would bypass the cache. This prevented authenticated requests from
making use of the cache and its configurable time-to-live.

This commit updates the caching operation invoker to include the
principal, if any, in its cache key. As a result, requests that
include a principal will make use of the cache, potentially returning
the result of a previous invocation of the same endpoint by the same
principal.

Closes gh-19538

Closes gh-20175

Closes gh-20514

Closes gh-20513

Closes gh-20512

Closes gh-20511

Closes gh-20510

This commit adds an additional 'layers/configuration' property that can
be used to refer to a separate layers configuration file. This separate
file defines:

* The layers and their order of precedence,
* How libraries are handled using filters that match against the
coordinates of each library, and
* How classes are handled using filters that match against the location
of the entry

An XSD to validate the XML configuration file is available.

Closes gh-20295
Co-authored-by: Stephane Nicoll <snicoll@pivotal.io>

Closes gh-20489

Closes gh-20469

* gh-20417:
  Polish "Add clearChecksums to Liquibase auto-configuration"
  Add clearCheckSums to Liquibase auto configuration

Closes gh-20417

See gh-20417

Liquibase auto configuration is extended with clearCheckSums to allow
to clear all checksums in the current changelog, so they will be
recalculated upon the next update.

See gh-20417

Closes gh-20503

Previously, DevToolsDataSourceCondition called
getBeanNamesForType(Class) which could trigger unwanted initialization
of lazy init singletons and objects created by FactoryBeans.

This commit updates DevToolsDataSourceCondition to prohibit eager
init when getting the names of the beans of a particular type.

Fixes gh-20430

Closes gh-20502

Closes gh-20501

Previously, DependencyCustomizer's ifAllResourcesPresent method
would return a customizer that added modules if any of the resources
were present. This commit corrects this behaviours so that modules are
only added if all resources are present.

Fixes gh-20418

* pr/20498:
  Polish

Closes gh-20498