R1:84568eba8465

Generate expected schemata for Maniphest

Summary:
Ref T1191.

- Adds support for custom fields.
- Adds support for partial indexes (indexes on a prefix of a column).
- Drops old auxiliary storage table: this was moved to custom field storage about a year ago.
- Drops old project table: this was moved to edges about two months ago.

Test Plan:
- Viewed web UI, saw fewer issues.
- Used `grep` to verify no readers/writers for storage or project table.

Reviewers: btrahan

Reviewed By: btrahan…