This commit adds compatibility with the Maven publish plugin, by
making sure that if the application is published, then the uber
jar is published as a classified artifact (`-uber`) in addition
to the regular jar.
A sample publishing configuration was added to the `app`, with
a "local" publishing repository in <rootproject>/build/repo.
For example, calling `./gradlew pAPTBR` will create the
`build/repo` directory with the corresponding Maven repository
structure after publishing.
This commit introduces a _convention plugin_ for RIFE2 support.
It provides a number of advantages:
- the build logic is clearly separated from the build script,
which now only contains user-specific configuration, like the
framework version or how to configure test logging
- it fixes a number of issues like hardcoded dependencies
(`dependsOn` is in general a mistake)
- it removes the need to resolve the agent path eagerly
- it makes the agent configurable
- it clearly separates the user classpath from the RIFE
classpath (both for precompiling templates and for the agent)
- template compilation is cached
- it avoids the abuse of `src/main/resources` to put
templates and uses a dedicated directory instead, which
removes the need for exclusions
In addition, this should make it relatively straightforward
to convert the convention plugin into a proper RIFE2 plugin,
by extracting the code in `build-logic` into its own
repository then publishing to the Gradle plugin portal.
