Improve the stardoc pipeline

[aiuto]

stardoc has no mechanism to propgate up docstrings from an implementation rule to a wrapper around it (e.g _license vs. license)

• So I built a post processor that does this.
• Somewhere in the recent past, bazel changed so that it never generates docs for any non-external rule, so I can't generate the docs for "_license".
• whump, whump, whump.

This PR mitigates that a bit by making the internal rules public. But I can't do that for "_license" without checking some underlying conditions.

DO NOT COMMIT