Add multi-source support to local and GCP provider #1454
Merged
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Signed-off-by: Willem Pienaar git@willem.co
What this PR does / why we need it:
The Provider model delegates control over which sources/stores can be used to individual provider implementations. #1437 moved the store logic into each provider. This PR separates out the offline store (sources) into their own class, allowing providers to opt into specific storage implementations (FileSource, BigQuerySource), while still granting control to providers to choose which providers they allow/disallow. More tangibly, we now allow a LocalProvider to use a BigQueryOfflineStore. We also allow a BigQueryProvider to use a FileOfflineStore.
Does this PR introduce a user-facing change?: