Add in-memory storage.

Test Plan

Land the two parent diffs, then rebase this one on top of them.

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Migrated from D645 (view on Phabricator)

• remove parent Diff from this Diff

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Merge request was returned for changes

• Move protected methods at the end of the class.
• Don't make the tool config part of the key.
• key tuples.
• no temp dict
• Create snap dict only in the if block.
• itertools.chain
• tool_add is a generator.

I'll work on your other comments after !113 (closed) lands; it's a bit hard to test without it.

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• Fix docstring.
• Remove person ids.

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• Use the same HashCollision as the pgsql storage.

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• Rebase (!113 (closed) has landed)

• Fix order of args of HashCollision to match the pg storage.

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• Remove useless assertion.
• Remove irrelevant doc.
• Small fixes.
• Fix test.
• Remove _origin_visit_key.
• dict.get(foo, None) -> dict.get(foo)
• Remove _origin_metadata_key.

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mentioned in commit b61cf3d4

• Explain why we use random.sample.

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