R1:31a0ed92d08d

Support a wider range of "Audit" rules for Owners packages

Summary:
Depends on D20124. Ref T13244. See PHI1055. Add a few more builtin audit behaviors to make Owners more flexible.

(At the upper end of flexibility you can trigger audits in a very granular way with Herald, but you tend to need to write one rule per Owners package, and providing a middle ground here has worked reasonably well for "review" rules so far.)

Test Plan:
- Edited a package to select the various different audit rules.
- Used…