Database writing multicall

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[X] Have you followed the guidelines in our Contributing document?
[X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

It add supports to writing multicall to the DatabaseResolver allowing users to send a batch of requests at one that will be handled by the API.

[X] Have you added an explanation of what your changes do and why you'd like us to include them?
[X] Have you written new tests for your core changes, as applicable?
[X] Have you successfully run tests with your changes locally?