Support for exteneded signing keys in runGYTxMonadIO

[euonymos]

Currently runGYTxMonadIO can't be used with extended keys.

I believe runGYTxMonadIO should use ToShelleyWitnessSigningKey type class instead of GYPaymentSigningKey argument.

Workaround: supply a dummy key to runGYTxMonadIO, use signGYTxBody which accept any keys.

[mikekeke]

I'm currently doing some tx building CLI for the project I'm working on using Atlas, and need to use wallet that I know seed phrase for. Having runGYTxMonadIO or something alike that accepts extended keys would be really handy.

[sourabhxyz]

Thanks for sharing your use case @mikekeke! We do something similar in our dex-contracts-api repository where we first load key from seed phrase (here) and then use it later to sign for tx, here. I am wondering if you could do something similar.

Also, the PR by Ilia related to this improvement should be merged today.

[mikekeke]

@sourabhxyz Thanks!