eval: split TestTransactionGroup from BlockEvaluator using TestEvalContext #5818
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Summary
eval.TestTransactionGroup (and TestTransaction) need only read-only access to a few details about the next pending block. This introduces an interface TestEvalContext that is used by the transaction pool, so that there can be parallel TX backlog workers checking if transactions are well-formed and move them from the backlogQueue to the postVerificationQueue.
Test Plan
WIP, existing tests should pass