:feature: Support fetching multiple layers in a single DB trip #25
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When dealing with maps with many layers there can be many API calls,
or, many DB hits depending on how the API is structured. These changes
allow for a single DB hit to fetch and concatenate all required layers
into a single response.
Please note that this work is currently just a proof-of-concept. I
would want to add tests, documentation, and clean up the code a
bit. I'd like to hear back about whether you think this is valuable or
not before comitting to tidying it up. Cheers!