docstore/all - add support for boolean filter

[ybourgery]

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This PR updates Docstore to allow boolean filters in the queries, as it's supported by all the different implementations.

This isn't yet merge-able as the replay data needs to be re-generated, and I don't have the permission to do it.

I have tested it with Firestore, the local version of MongoDB but haven't tested it with AWS or Azure as I don't have an account.