Add APIs for recording_id and application_id

[jleibs]

What

• Resolves: Add Recording.get_{recording|app}_id() #7628

Needed to track the StoreId on the ChunkStore as well.

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
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  • Using examples from latest main build: rerun.io/viewer
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• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
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[Wumpf]

why exclude from changelog? seems like a nice userfacing addition

[Wumpf]

looks convenient!

[jleibs]

why exclude from changelog? seems like a nice userfacing addition

Incremental changes to a new API surface before that API surface has been exposed are in a bit of a gray area. Don't feel strongly either way.

[abey79]

why exclude from changelog? seems like a nice userfacing addition

It would be neat to have our changelog script generate a single line for new feature, followed by a massive dump of all PR numbers involved.