Release the java runfiles library as a maven coordinate

When working on a project that doesn't build with bazel but needs to use the runfiles library (for example, when porting a project from gradle to bazel) there's no easy way to access the java runfiles library. [The Python world exports theirs as a wheel](https://pypi.org/project/bazel-runfiles/).

It would be helpful to expose the java runfiles library as a maven coordinate.

Bazel projects can either not use the coordinate or use a `maven.override` to point to the Bazel-provided version.

Start by locating the Java runfiles library and the repository's existing release configuration. Determine how the library could be published as a Maven coordinate while preserving the Bazel-provided version path, then verify that a non-Bazel consumer can resolve and use the published artifact.

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