[ENH] Synchronize post s3.get() operations in providers #2712
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Description of changes
Summarize the changes made by this PR.
Adds synchronization points in hnsw_provider and blockfile provider for concurrent cache inserts to the same key. This prevents dangling references to entries that the cache is not aware of. For the HNSW provider, we also synchronize writing out the index byte buffer to the local files since that is not guaranteed to be thread safe.
Test plan
pytest
for python,yarn test
for js,cargo test
for rustDocumentation Changes
None