Allow indexing + filtering/querying by `creator`

[LiranCohen]

Currently author relates to the author of a Record, however a different actor may come and update that record.

Add an index for creator which is the author of the initial write, subsequent writes will index the author of the initial write as the creator.

When filtering, allow for filtering by a single or array of creators.

[29deepanshutyagi]

.take

[github-actions[bot]]

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[taniashiba]

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