Issue bundle serialization and digest

[alexeykoren]

Issue bundle serialization and digest

[what-the-diff]

PR Summary

• Add new field and update serialization functions for Bundle
  Enhances the Bundle struct in zcash_primitives and updates all associated serialization/deserialization functions.
• Introduce tests, including fuzzing
  Adds tests to ensure the proper functioning of the above mentioned changes, including fuzz testing with proptest.
• Enhance TransactionData with issuance support
  Adds issuance support to TransactionData for improved transaction management.
• Update signature hash for v5 transactions
  Improves the signature hash function for version 5 transactions.
• Add new field to TxDigests struct and implement digest_issue
  Enhances the TxDigests struct with a new field and implements the digest_issue function in the TransactionDigest trait for better commitment digester handling.
• Update hash functions to include issue commitment
  Enhances hash_transparent_txid, hash_sapling, and hash_orchard functions to include issue commitment for more reliable transaction processing.
• Correct return type for orchard::commitments functions
  Updates the return type of orchard::commitments::hash*empty functions to Blake2bHash instead of Option for better consistency.

[alexeykoren]

Fix TODO or create task