ZIP-244: Implement sighash for Non-Malleable Transaction Ids

[teor2345]

Is your feature request related to a problem? Please describe.

ZIP-244 defines a new transaction digest algorithm currently planned to be applied from the NU5 network upgrade onward.

ZIP-244 creates non-malleable transaction identifiers that commit to all transaction data except for attestations to transaction validity. (That is, signatures and proofs.)

ZIP-244 also adds an updated sighash algorithm.

Describe the solution you'd like

We should implement or integrate this new transaction digest algorithm in Zebra as per:

• https://zips.z.cash/zip-0244
• https://zips.z.cash/zip-0225#modifications-to-zip-244

This will include:

Sighash updates

• update sighash based on ZIP-244 with Orchard changes using librustzcash
  • see ZIP-244 & ZIP-245: creation of non-malleable txids + TZE signature hashing zcash/librustzcash#319