json: add "dynamic" field to plugin list

CHANGELOG: add "dynamic" field to plugin list

doc/lightning-plugin.7.md

@@ -56,6 +56,7 @@ If **command** is "start", "startdir", "rescan" or "list":
   - **plugins** (array of objects):
     - **name** (string): full pathname of the plugin
     - **active** (boolean): status; plugin completed init and is operational, plugins are configured asynchronously.
+    - **dynamic** (boolean): plugin can be stopped or started without restarting lightningd
 
 If **command** is "stop":
   - **result** (string): A message saying it successfully stopped
@@ -80,4 +81,4 @@ RESOURCES
 Main web site: <https://github.com/ElementsProject/lightning>
 
 [writing plugins]: PLUGINS.md
-[comment]: # ( SHA256STAMP:ee9c974be30d7870cb6a7785956548700b95d2d6b3fe4f18f7757afdfa015553)
+[comment]: # ( SHA256STAMP:5c3b25ecb137bfe7a81f80f0b4183a9e1282530ebfac3b1bc05fc5406f59cfc7)

doc/schemas/plugin.schema.json

@@ -48,7 +48,8 @@
               "additionalProperties": false,
               "required": [
                 "name",
-                "active"
+                "active",
+                "dynamic"
               ],
               "properties": {
                 "name": {
@@ -58,6 +59,10 @@
                 "active": {
                   "type": "boolean",
                   "description": "status; plugin completed init and is operational, plugins are configured asynchronously."
+                },
+                "dynamic": {
+                  "type": "boolean",
+                  "description": "plugin can be stopped or started without restarting lightningd"
                 }
               }
             }

lightningd/plugin_control.c

@@ -34,6 +34,7 @@ static struct command_result *plugin_dynamic_list_plugins(struct plugin_command
 		json_add_string(response, "name", p->cmd);
 		json_add_bool(response, "active",
 		              p->plugin_state == INIT_COMPLETE);
+		json_add_bool(response, "dynamic", p->dynamic);
 		json_object_end(response);
 	}
 	json_array_end(response);