cln-rpc: Yet more RPC methods being mapped

- disconnect
 - feerates
 - getroute
 - listforwards
 - listpays
 - ping
 - signmessage

doc/schemas/feerates.request.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "additionalProperties": false,
+  "required": [
+    "style"
+  ],
+  "properties": {
+    "style": {
+      "type": "string",
+      "enum": [
+        "perkb",
+        "perkw"
+      ]
+    }
+  }
+}