please add new types for NUT-15

[KraXen72]

the library does not provide type definitions for NUT15.
please add them.
this is how i'm patching it for now.
feel free to use the code.

import { GetInfoResponse as _GetInfoResponse } from '@cashu/cashu-ts'
type NUT15Entry = { method: string, unit: string, mpp: boolean }
type GetInfoResponse = _GetInfoResponse & {
  nuts: {
    15: Array<NUT15Entry>
  }
}

[callebtc]

Would you like to open a PR with this patch?

[KraXen72]

sorry, i just realized, in minibits we are using our own fork of cashu-ts library. i'll first try to implement it there, so i can test it, and then if it works i can try to port it to here.