[crypto] Changes `types::SignedTransaction` to use the nextgen crypto API #429
This changes the following behavior:
Why this is better
Why this is worse
*This changes the following behavior:* - Propagates the change onto the rest of the code base *Why this is better* - continues the nextgen_crypto API - removes copies of private key material effected through copies of `Account`s - makes tests deterministic, with exception of the functional_tests, outlines the dependency on `e2e_tests::Account::new()` returning differnet values *Why this is worse* - n/a *Future work* - remove remaining instances of crypto::signing (just a few of them, exclusively in tests) - switch the network identity key to the nextgen_crypto implementation of X25519 Traduces `types/transaction.rs` and dependents to nextgen_crypto API
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