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search: introduce ConfigFingerprint

Administrator requested to merge k/cursor into main

Created by: keegancsmith

This is the opaque structure used by Sourcegraph to minimize the amount of work done when zoekt polls for repository options. It is a timestamp and a hash of the configuration. Using these two bits of information, we can heuristically calculate what has changed since the fingerprint.

We version the fingerprint format since we expect changes in the future as the requirements of inputs to IndexOptions changes.

Note: this only introduces the structure, but does not use it yet.

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