feat: better FFI feedback from transaction validation #4827
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Description
This returns a u64 rather than a bool for the transaction validation callback.
Motivation and Context
Using a bool, the subscriber only knows if the validation runs through without error or failed.
By returning a u64 we give the subscriber much more information.
0: successfully
1: Already running
2: Internal failure
3: Communication failure.
How Has This Been Tested?
unit tests
Fixes: #4806