multi: add bumpforceclosefee rpc endpoint.

Add a new bumpforceclosefee rpc endpoint to the wallet server.
Move the logic from the lncli level to the wallet server rpc level.
This is more in line with a proper client-server design.

wallet lncli: use new bumpforceclosefee endpoint.

Besides using the new bumpforceclosefee rpc endpoint we also enable the
bumping of taproot anchor channels.

lnrpc/walletrpc/walletkit.yaml

@@ -76,3 +76,6 @@ http:
     - selector: walletrpc.WalletKit.RemoveTransaction
       post: "/v2/wallet/removetx"
       body: "*"
+    - selector: walletrpc.WalletKit.BumpForceCloseFee
+      post: "/v2/wallet/BumpForceCloseFee"
+      body: "*"