refactor(external_cmd_selector): rework parameters

Signed-off-by: Batuhan Beytekin <batuhanbeytekin@gmail.com>

Author: batuhanbeytekin

control/autoware_external_cmd_selector/README.md

@@ -32,3 +32,7 @@ The current mode is set via service, `remote` is remotely operated, `local` is t
 | `/external/selected/hazard_lights_cmd`                 | autoware_vehicle_msgs::msg::HazardLightsCommand   | Pass through hazard light with current mode.    |
 | `/external/selected/heartbeat`                         | TBD                                               | Pass through heartbeat with current mode.       |
 | `/external/selected/turn_indicators_cmd`               | autoware_vehicle_msgs::msg::TurnIndicatorsCommand | Pass through turn indicator with current mode.  |
+
+## Parameters
+
+{{json_to_markdown("control/autoware_external_cmd_selector/schema/external_cmd_selector.schema.json")}}

control/autoware_external_cmd_selector/schema/external_cmd_selector.schema.json

@@ -0,0 +1,40 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Parameters for external_cmd_selector",
+    "type": "object",
+    "definitions": {
+      "external_cmd_selector_node": {
+        "type": "object",
+        "properties": {
+          "update_rate": {
+            "type": "number",
+            "default": 10.0,
+            "description": "The rate in Hz at which the external command selector node updates."
+          },
+          "initial_selector_mode": {
+            "type": "string",
+            "enum": ["local", "remote"],
+            "default": "local",
+            "description": "The initial mode for command selection, either 'local' or 'remote'."
+          }
+        },
+        "required": [
+          "update_rate",
+          "initial_selector_mode"
+        ]
+      }
+    },
+    "properties": {
+      "/**": {
+        "type": "object",
+        "properties": {
+          "ros__parameters": {
+            "$ref": "#/definitions/external_cmd_selector_node"
+          }
+        },
+        "required": ["ros__parameters"]
+      }
+    },
+    "required": ["/**"]
+  }
+