feat(cli): Add wallet:decrypt

[rohanjadvani]

Summary

Add CLI command to encrypt the wallet

Testing Plan

❯ f wallet:decrypt -d ~/.ironfish-1
yarn run v1.22.18
$ yarn build && yarn start:js wallet:decrypt -d /home/rohan/.ironfish-1
$ tsc -b
? Enter a passphrase to decrypt the wallet: invalid
Wallet decryption failed

❯ f wallet:decrypt -d ~/.ironfish-1
yarn run v1.22.18
$ yarn build && yarn start:js wallet:decrypt -d /home/rohan/.ironfish-1
$ tsc -b
? Enter a passphrase to decrypt the wallet: foobar
Decrypted the wallet
Done in 2.58s.

Documentation

Does this change require any updates to the Iron Fish Docs (ex. the RPC API
Reference)? If yes, link a
related documentation pull request for the website.

[ ] Yes

Breaking Change

Is this a breaking change? If yes, add notes below on why this is breaking and label it with breaking-change-rpc or breaking-change-sdk.

[ ] Yes