Establish a "Support Level" rating for rules

[gravypod]

How would everyone feel about standardizing on a support level rating that we could apply to rule sets? We could specify things like:

1. Is this rule set owned?
2. Do they reply to opened issues and PRs?
3. Is there free and paid support for the rule sets?

This might make it clearer to a new user of Bazel how ready the ecosystem is for their use case.

[alexeagle]

Yes this is the intent of the catalog (#2)

[alexeagle]

#15 (comment) had a great suggestion on how to gather some of the relevant metrics like "do they reply to issues/PRs".

https://dashboard.bazel.build/ also seems to be powered by some analysis, which it would be nice if we could re-use. @hicksjoseph or @philwo do you know where that data pipeline lives? Could the SIG host another copy of that, or would you add more rulesets to it?

[jsharpe]

Dashboard code seems to be here: https://github.com/bazelbuild/continuous-integration/tree/master/dashboard

[hicksjoseph]

@sventiffe may have some thoughts about this.