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Description
This PR removes the TransactionManager module, and replace it with a new ExecutionScheduler.
This scheduler no longer uses a cache to manage object dependency explicitly. Instead, it now uses the newly added notify_wait_input_object function to wait on the input objects directly in a tokio thread.
It also refactors the per-object congestion queue to a separate file for better clarity.
Test plan
Ported all the old tests over to the new module.
Release notes
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