Add a Maven project to aggregate appropriate Javadocs into a
consolidated set.

Increase the timeouts to give CI builds more time should dependencies
be missing.

Remove sample gradle builds since they are not run during the regular
build and would need to be manually updated after a release.

In particular this allows a YAML externalization as an array
as opposed to a CSV.

The AbstractDataSourceConfiguration had path= in its
@ConfigurationProperties by mistake (should have been value)

If the user sets security.basic.enabled=false we should just
back away from the non-management endpoints completely.
Previously the Spring Security filter was still added but with
no authentication, creating complications when unexpected
headers etc. are added by Spring Security.

Refine the loading order of LaunchedURLClassLoader to consider the
root loader before locally bundled classes.

The prevents classes from locally bundled JARs from replacing system
classes.

Issue: #56232870

Update spring-boot-loader to allow `-javaagent` instrumentation when
running from executable jars.

Prior to this commit the `Launcher` skipped the application classloader
and instead used the system classloader as a parent. This was to ensure
that locally packaged classes were always loaded by the classloader
that had access to nested jars.  Unfortunately when using the
`-javaagent` option, it is the application classloader that is modified.

The `Launcher` class now uses the application classloader as parent
and `LaunchedURLClassLoader` has been updated to always search local
URLs before delegating to the parent. This is very similar to the way
that most application servers handle the loading of war files.

Issue: #56232870

Snake is stateful so it should be one per connection. Echo is the
opposite.

Update CLI SpringMvcCompilerAutoConfiguration to recognize Spring's new
@RestController annotation.

Add version properties to dependencies POM so that users can easily
override. Also use consistent naming for all property keys.

Move JPA @Condition annotations from JpaBaseConfiguration to
HibernateJpaAutoConfiguration since they are not inherited.

Provide accurate InputStream.available() results by using the size
attribute of the ZipEntry. This helps improve performance with
CGLib and also fixes issues where libraries expect that a non-zero
result from available() indicates that read() will not return -1.

Add maven-compler-plugin to starter POM in an attempt to fix drone.io
errors downstream.