R1:c3b2184977f5

Mostly modernize Conduit logs

Summary:
- Add GC support to conduit logs.
- Add Query support to conduit logs.
- Record the actual user PHID.
- Show client name.
- Support querying by specific method, so I can link to this from a setup issue.

@wez, this migration may not be fast. It took about 8 seconds for me to migrate 800,000 rows in the `conduit_methodcalllog` table. This adds a GC which should keep the table at a more manageable size in the future.

You can safely delete all data older than…