Add an option to enable/disable JSDoc autocomplete (#23704)

* Add new option to disable/enable jsdoc autocompletion

* Refactor JsDocCompletionItem

- remove internal command
- move TS service call and template generation to CompletionItem
- only call TS service if JSDoc completion is enabled in settings
- add local config and config update method to CompletionProvider

* Change how and when JsDocCompletionHelper is registered

Register JsDocCompletionHelper and update configuration in registerProviders instead of activate. Also react to configuration change.

* Rename JsDocCompletionHelper to JsDocCompletionProvider

* Add missing newline at the eof

* Restore completion prompt for JSDoc autocomplete

Restores internal command but but as a separate class. Registers command on extension activation.

extensions/typescript/package.json

@@ -280,6 +280,11 @@
           "type": "boolean",
           "default": false,
           "description": "%format.placeOpenBraceOnNewLineForControlBlocks%"
+        },
+        "jsDocCompletion.enabled": {
+          "type": "boolean",
+          "default": true,
+          "description": "%jsDocCompletion.enabled%"
         }
       }
     },