feat: add boltz client fundingsource (#2358)

* feat: add boltz client standalone fundingsource
WIP.
https://docs.boltz.exchange/v/boltz-client

this fundingsource utilizing the boltz client standalone function: https://github.com/BoltzExchange/boltz-client/pull/123
this makes him act like a lightning node while submarine swapping everything on liquid network. like aqua does in its wallet.

* feat: paid_invoices_stream

* feat: proper invoice and payment status check

* feat: authenticate over insecure channel aswell

* chore: lint

* docs: add more setup instructions

* chore: add `boltz_client_cert` in frontend

* feat: populate fee_msat in get_payment_status and get_invoice_status

* fixup!

* chore: bundle

* added boltz logo

* add BoltzWallet to __all__

* chore: bump grpcio and protobuf deps and add grpcio-tools as dev dependency

* chore: update protos

* feat: pass description when creating swap

* fixup!

* chore: bundle

---------

Co-authored-by: jackstar12 <jkranawetter05@gmail.com>
Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

lnbits/settings.py

@@ -270,6 +270,13 @@ class BreezSdkFundingSource(LNbitsSettings):
     breez_greenlight_device_cert: Optional[str] = Field(default=None)
 
 
+class BoltzFundingSource(LNbitsSettings):
+    boltz_client_endpoint: Optional[str] = Field(default="127.0.0.1:9002")
+    boltz_client_macaroon: Optional[str] = Field(default=None)
+    boltz_client_wallet: Optional[str] = Field(default="lnbits")
+    boltz_client_cert: Optional[str] = Field(default=None)
+
+
 class LightningSettings(LNbitsSettings):
     lightning_invoice_expiry: int = Field(default=3600)
 
@@ -286,6 +293,7 @@ class FundingSourcesSettings(
     LnPayFundingSource,
     BlinkFundingSource,
     AlbyFundingSource,
+    BoltzFundingSource,
     ZBDFundingSource,
     PhoenixdFundingSource,
     OpenNodeFundingSource,
@@ -436,6 +444,7 @@ class SuperUserSettings(LNbitsSettings):
     lnbits_allowed_funding_sources: list[str] = Field(
         default=[
             "AlbyWallet",
+            "BoltzWallet",
             "BlinkWallet",
             "BreezSdkWallet",
             "CoreLightningRestWallet",