feat: Thread-safety for persistent and ephemeral clients #49

Job	Run time
test (3.7, ubuntu-latest, --ignore-glob 'chromadb/test/property/*' --ignore='chromadb/test/test_c...	8m 19s
test (3.7, ubuntu-latest, chromadb/test/property/test_add.py)	4m 4s
test (3.7, ubuntu-latest, chromadb/test/test_cli.py)	2m 55s
test (3.7, ubuntu-latest, chromadb/test/property/test_collections.py)	3m 18s
test (3.7, ubuntu-latest, chromadb/test/property/test_cross_version_persist.py)	10m 38s
test (3.7, ubuntu-latest, chromadb/test/property/test_embeddings.py)	22m 4s
test (3.7, ubuntu-latest, chromadb/test/property/test_filtering.py)	4m 0s
test (3.7, ubuntu-latest, chromadb/test/property/test_persist.py)	14m 30s
test (3.7, windows-latest, --ignore-glob 'chromadb/test/property/*' --ignore='chromadb/test/test_...	2m 8s
test (3.7, windows-latest, chromadb/test/property/test_add.py)	2m 0s
test (3.7, windows-latest, chromadb/test/test_cli.py)	1m 51s
test (3.7, windows-latest, chromadb/test/property/test_collections.py)	2m 40s
test (3.7, windows-latest, chromadb/test/property/test_cross_version_persist.py)	2m 18s
test (3.7, windows-latest, chromadb/test/property/test_embeddings.py)	2m 17s
test (3.7, windows-latest, chromadb/test/property/test_filtering.py)	2m 32s
test (3.7, windows-latest, chromadb/test/property/test_persist.py)	2m 12s
	1h 27m 46s

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