Fixes #8462 - move accessory notes into pivot table

[snipe]

This should fix the notes issue reported in #8462, and adds a check-out date for the listings.

The migration is a little gross, as we have to find the matching rows from the action_logs table and copy them over into the accessories_users table, but it seems to get the job done without having us consistently hammering the action_logs table, which can get kinda big over time.

@uberbrady I'd love your eyes on this, if you can pull down this branch. To test this, check out a few accessories to a few different users before pulling the branch, then pull the branch down, and run migrations.

[uberbrady]

This looks great, and makes a lot of sense. The best way to associate a particular checkout of a particular accessory at a particular time with a particular note - is to put the note in the actual join record itself.