Hide mnemonic code when `namadaw derive`

[Rigorously]

When namadaw derive the input for the password is hidden, but not for the mnemonic code. For consistency and security, consider to show sensitive input during user input and hide it after user has submitted, or do not show any sensitive input at all.

Also, there are inconsistent terminology in the CLI and browser extension: "encryption password", "passphrase" "mnemonic code", "seed phrase"

Behavior as of v0.44:

Using HD derivation path m/44'/877'/0'/0'/0'
Enter your encryption password: 
Enter same passphrase again: 
Input mnemonic code:   apple banana lemon peanut```