feat: add potentiallyStale filter

[thomasheartman]

This PR adds support for the potentiallyStale value in the feature search API. The value is added as a third option for state (in addition to stale and active). Potentially stale is a subset of active flags, so stale flags are never considered potentially stale, even if they have the flag set in the db.

Because potentially stale is a separate column in the db, this complicates the query a bit. As such, I've created a specialized handling function in the feature search store: if the query doesn't include potentiallyStale, handle it as we did before (the mapping has just been moved). If the query does contain potentially stale, though, the handling is quite a bit more involved because we need to check multiple different columns against each other.

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