Michel Weststrate 0dc1abdac4 Initial DataSource setup ...

Summary:
For context see https://fb.workplace.com/notes/470523670998369

This diff introduces the DataSource abstraction, that can store records. If a key is set a key -> record mapping is stored, to make it easy to update existing records using `upsert`, without knowing their exact index.

Internal storage will be slightly altered in upcoming diffs, so don't pay to much attention to that part.

Reviewed By: nikoant

Differential Revision: D25953337

fbshipit-source-id: 1c3b53a2fcf61abaf061946be4af21d2aecc6c6d

2021-03-16 15:03:42 -07:00

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