Sort JSONC files on save (#188480)

* adding the initial code for sorting on save setting

* adding code, it is working, but how to get the text editor options

* cleaning the code

* making the callback synchronous, why does waitUntil not work

* removed unwated edit

* previously the check on is text edit instance was throwing an error, now checking manually that it is working

* chaning the return type of `getOptionsForDocument` to udnefined by default

* Convert to TextEdit instances

---------

extensions/json-language-features/package.json

@@ -91,6 +91,12 @@
           "default": false,
           "description": "%json.format.keepLines.desc%"
         },
+        "json.sortOnSave.enable": {
+          "type": "boolean",
+          "scope": "window",
+          "default": false,
+          "description": "%json.sortOnSave.enable.desc%"
+        },
         "json.trace.server": {
           "type": "string",
           "scope": "window",