feat: mnemonic generation for spark connector

[pavanjoshi914]

1. we cant add conditionals directly in state level to check if mnemonic is present or not as it breaks other connectors
2. update connector config to use mnemonic passed from account variable
3. I have to introduce new script to encrypt mnemonic ( we store mnemonic encrypted and when account variable is saved it should have encrypted one and we have decrypt mechanism in settings page when its shown )
4. but spark don't accepts this encrypted mnemonic so the flow is:: generate and encrypt mnemonic at screen level --> pass to connector when initializing --> decrypt and pass it to initialized method and then rest of the flows such as mnemonic showing in settings page will work

[rolznz]

is this OK? I saw we have an existing setMnemonic function which will also derive the nostr key

[rolznz]

I guess we can't use that though because we need the account to be properly setup before validating it

[pavanjoshi914]

yess! at this stage there is no account stored in db. so we can't use that script

[rolznz]

But what about the nostr key? do we need to do anything there?

[rolznz]

utACK