Closes gh-13243

* pr/13274:
  Fix javadoc

Closes gh-13274

* pr/13271:
  Add enforce-rule to ensure maven version >= 3.5.0

Closes gh-13271

The `HelpMojo` class is always generated and it should not be checked
for formatting.

See gh-13255

* pr/13266:
  Add missing semicolon in example

Closes gh-13266

Use `spring-javaformat` to format and check code. Code formatting can
now be applied using the `spring-javaformat-maven-plugin` from the
command line. Existing checkstyle rules have also been replaced and
the CONTRIBUTING.adoc file has been updated.

Closes gh-13255

* pr/13260:
  Fix documentation error

Closes gh-13260

Closes gh-13245

Closes gh-13231

Closes gh-13231

Update CI pipeline so that the `sync-to-maven-central` job has access
to the artifactory build info.

Closes gh-13223

Update contributing documentation and the issue template with
instructions on how to report security vulnerabilities.

Closes gh-12509

* pr/13208:
  Polish contribution
  Support custom UriTemplateHandler in LocalHostUriTemplateHandler

Closes gh-13208

See gh-13208

The ConnectionFactory can be used early in user configuration to
configure an `Exchange`. Such connection may not hold the proper
MetricCollector and can be cached, leading to missed metrics
information.

This commit moves the configuration of RabbitMQ metrics to a
BeanPostProcessor so that the proper MetricCollector is configured
before any connection is created.

Closes gh-12855

Closes gh-13127

* pr/13192:
  Polish