Mega-merge 4: Reenable LndWallet gRPC and use TrackPaymentV2 (#745)

* readd lndgrpc

* debug logging

* Use TrackPaymentV2

* /v2/router/track

* lnd_router_grpc

* flag for blocking check

* error handling

* fix name

* regtest lndgrpc

* new test pipeline

* fix env

* check for description hash

* remove unnecessary asserts for clarity

* assume that description_hash is a hash already

* no lock

* description hashing in backend

* restore bolt11.py

* /api/v1/payments with hex of description

* comment

* refactor wallets

* forgot eclair

* fix lnpay

* bytes directly

* make format

* mypy check

* make format

* remove old code

* WIP status check

* LND GRPC docs

* restore cln to main

* fix regtest

* import

* remove unused import

* format

* do not expect ok

* check ok

* delete comments

docs/guide/wallets.md

@@ -37,6 +37,22 @@ or
 
 - `LND_REST_MACAROON_ENCRYPTED`: eNcRyPtEdMaCaRoOn
 
+### LND (gRPC)
+
+Using this wallet requires the installation of the `grpcio` and `protobuf` Python packages.
+
+- `LNBITS_BACKEND_WALLET_CLASS`: **LndWallet**
+- `LND_GRPC_ENDPOINT`: ip_address
+- `LND_GRPC_PORT`: port
+- `LND_GRPC_CERT`: /file/path/tls.cert
+- `LND_GRPC_MACAROON`: /file/path/admin.macaroon or Bech64/Hex
+
+You can also use an AES-encrypted macaroon (more info) instead by using
+
+- `LND_GRPC_MACAROON_ENCRYPTED`: eNcRyPtEdMaCaRoOn
+
+To encrypt your macaroon, run `./venv/bin/python lnbits/wallets/macaroon/macaroon.py`.
+
 ### LNbits
 
 - `LNBITS_BACKEND_WALLET_CLASS`: **LNbitsWallet**