Split NWC client and webln provider

[bumi]

NWC and webln are not fully compatible.
currently our NWC client is webln compatible which limits us using some NWC details

We should split this up
and make a NWC client independent of WebLN.

Maybe we make a NWC class and the NWC webln provider inherits from that one?

[rolznz]

Or @bumi 's other suggestion:

maybe have a NWC client and a NWC WebLN Provider uses that and returns the webln required data.