Handle transactions as opaque objects of bytes or List[bytes] until VM can deterministically decode them

[carver]

What was wrong?

Trinity assumes that it knows the shape of a transaction (that it is an rlp decoded list of values). This is all broken in Berlin.

How was it fixed?

Generalize the transaction handling, before trying to do the Berlin upgrade.

To-Do

• [x] Clean up commit history

• [x] Add entry to the release notes

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