* Lightning payment info and fee handling
Builds on the additions in btcpayserver/BTCPayServer.Lightning#59 and btcpayserver/BTCPayServer.Lightning#61.
Adds payment information (total amount and fees) to the API response and allows to set an optional maximum fee percentage when paying.
* Add max fee flat
* wip
* Local GreenField Client for Plugins
* support notification handlers being missing
* Initial support for scoped btcpay client
* test out scoped local client
* wip
* small fix
* Throw exception if using local greenfield client and it has not been implemented yet
* adapt based on new changes in BTCPay
* update
* fix tests
* Allow Local client to bypass authorization handler
* Add Misc endpoints to Local API Client
* Add new endpoints
* Apply code review changes
* GreenField: Cross-implemenation Lightning Node API
* switch to hard unrsstricted check
* fix
* set LightningPrivateRouteHints in swagger + stores api
* add priv route hint
* rename models and add swagger defs to models
