Commits: Add collection id field to commits fields

[AndrewSisley]

Part of #549

We want a new field that holds the id of the collection that the commit was commited against. It should be requestable via the commits and latestCommits queries. Grouping by this field should probably be tested in this ticket as we may gain that (desired) behaviour for free.

[AndrewSisley]

Had a good old chat about this on Discord, thread dev-db/"Commit index(es)" https://discord.com/channels/427944769851752448/1034921488618360883

Will park this issue until after the implementation of branchable collections, as significant changes may be made then.

Is some WIP code in sisley/feat/I849-commit-collection-id-2, but how much of it will be useful by the time this gets picked up again is unknown

[islamaliev]

@AndrewSisley does it mean the task in not ready yet? Maybe then it makes sense to move it to "Blocked" column?

[AndrewSisley]

I'd prefer not to keep backlog items in 'blocked', it would grow to be pointlessly busy.

This ticket might actually be quite easy now, as the Schema Version ID has been added to commits since and can probably be used to get the collection ID.