[firestore-bigquery-export] Add user to changelog

[davestimpert]

[READ] Step 1: Are you in the right place?

Yes

[REQUIRED] Step 2: Extension name

This feature request is for extension: _ (firestore-bigquery-export)

What feature would you like to see?

Add the authed user to change logs.

How would you use it?

It would be useful for a number of reasons to know who the authenticated user was that made each change to a firestore document. It would allow us to use the changelog as an audit log, and it would also help us for building reports based on the user that made modifications.

[dackers86]

Thanks @davestimpert

Added to the project board for consideration.

[davestimpert]

I tried to do this myself but it is seemingly impossible since auth isn't available in the context