Generate a parser for MASP transactions.

[murisi]

Describe your changes

Wrote a utility to convert the Borsh schemas for MASP Transactions and MaspBuilders into C parsers for Ledger hardware wallets. More specifically, the changes are as follows:

• Now use a MASP branch with more correct Borsh schemas for Transaction and Builder
• Fixed the BorshSchema for MaspBuilder
• Implemented a C parser generator supporting a range of schema Definitions
• Created an example named generate-parser to invoke the parser generator

Indicate on which release or other PRs this topic is based on

Namada v0.31.4
anoma/masp#71

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state