Add E2E Tests for MASP Wallet

[murisi]

Make E2E tests for MASP wallet functionality to prevent future regressions. It should essentially test all subcommands of anomaw masp. I.e. under various CLI parameters, it should test the correct functioning of:

• namadaw masp gen-addr ...
• namadaw masp add ...
• namadaw masp gen-key ...
• namadaw masp list-keys ...
• namadaw masp list-addrs ...
• namadaw masp find ...

See transparent wallet E2E tests at tests/src/e2e/wallet_tests.rs for guidance on how to do this.

[karbyshev]

The wallet CLI structure has been changed #2135

[brentstone]

@murisi @batconjurer @grarco @Fraccaman how relevant is this issue still?