R1:8605a1808d01

Hide direct accesses to Audit inline comment table behind API

Summary: Ref T4896. Move all direct accesses to the inline comment table behind a small amount of API to make it easier to migrate the table.

Test Plan:
- Grepped for `PhabricatorAuditInlineComment`.
- Grepped for `audit_inlinecomment`.
- Created a draft comment.
- Previewed a draft comment.
- Reloaded page, still saw draft.
- Viewed standalone, still saw draft.
- Made comment, inline published.
- Added a draft, saw both.