Introduce ComputeWith classes to detect compute features #2392
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Part of #2372
This PR moves optional
Computemethods toComputeWith*feature classes. This makes it explicit which methods are required for different features and also allows buildingBACKENDS_WITH_*lists dynamically instead of hardcoding them.Notes:
assert isinstance(compute, ComputeWithPlacementGroupSupport). This is still better than previous implicit assumption about method being implemented.BACKENDS_WITH_*lists now contain only available backend types. This does not affect any behavior except for error messages that return supported backend types. Errors are clarified to return available backend types.