feat: phoenixd wallet integration (#2362)

* phoenixd integration
---------

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

lnbits/wallets/__init__.py

@@ -23,6 +23,7 @@ from .lndrest import LndRestWallet
 from .lnpay import LNPayWallet
 from .lntips import LnTipsWallet
 from .opennode import OpenNodeWallet
+from .phoenixd import PhoenixdWallet
 from .spark import SparkWallet
 from .void import VoidWallet
 from .zbd import ZBDWallet