Feat: extensible projections #607
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Why is this change proposed?
Current approach requires registering Stream Source, StateStorage and PartitionProvider per projection. However those contains exactly the same logic for each projection even so the logic is the same and differs on the input given.
This PR introduces Registry for each concept and allow to customize it per projection with attributes on the side of userland. Which follows way we provide ability to hook in Repository (implement interface and mark with attribute).
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