Add crates index manager abstraction #689
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The full crates.io index corpus is too large and growing too fast to realistically assume we can have access to it all at once for inference purposes. This new component enables us to keep a fixed-size cache of snapshots on disk while rotating the least used snapshots out when other snapshots are requested. We unconditionally keep the current (i.e. non-archived) index cloned given it is the newest and most likely to be requested during inference. The interface also supports loading index portions from an existing filesystem which means it can also be used transiently to mediate access to these resources.
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The full crates.io index corpus is too large and growing too fast to
realistically assume we can have access to it all at once for inference
purposes. This new component enables us to keep a fixed-size cache of
snapshots on disk while rotating the least used snapshots out when other
snapshots are requested. We unconditionally keep the current (i.e.
non-archived) index cloned given it is the newest and most likely to be
requested during inference.
The interface also supports loading index portions from an existing
filesystem which means it can also be used transiently to mediate access
to these resources.