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Transaction signing is something that happens in a lot of places - this PR introduces primitives for transaction signing in `transaction_utils` such that we can use the same logic across web3/eth1/etc for this simple operation. `transaction_utils` also contains a few more "spec-derived" helpers for working with transactions, such as the computation of a contract address etc that cannot easily be introduced in `transactions` itself without bringing in dependencies like secp and rlp, so they end up in a separate module. Finally, since these modules collect "versions" of these transaction types across different eips, some tests are moved to follow the same structure.