Improve HTTP API to log decisions for /v1/compile endpoint

[tsandall]

Currently, the partial evaluation API exposed via /v1/compile is not integrated with the decision logger. We should extend the HTTP server to log decisions for the /v1/compile endpoint. Because partial evaluation supports additional parameters compared to normal evaluation, we'll need to extend the decision log record to include fields for PE parameters. Initial support can add unknowns. In the future we can add inlining controls as well.

Since the /v1/compile endpoint is invoked with a query instead of a path, the decision log records should set the query field.

[srenatus]

#3062 -- duplicate? This issue is more specific about how to do it, so I'll close the other one.

[stale]

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