Tighten rules around metric-in-filter

[shangyian]

Summary

Defines and enforces the contract for what kinds of filters /sql/measures/v3 and /sql/measures/v3 accept. This change makes it so that filters are validated upfront and gives precise 422s for the two specific misuses (metric not in list, metric filter on the measures endpoint) instead of obscure downstream errors.

In /sql/measures/v3, we only accept dimension filters, so any metric filters will result in a 422.
In /sql/metrics/v3: dimension filters will end up in WHERE, metric filters in HAVING, and filters on metrics that aren't part of the requested list of metrics results in a 422.

Test Plan

• PR has an associated issue: #
• make check passes
• make test shows 100% unit test coverage

Deployment Plan

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