Use Services global variable if possible

Services.jsm is planned to be removed in Firefox 117 cycle in https://bugzilla.mozilla.org/show_bug.cgi?id=1780695 .
Services global variable is available in WebExtensions experiments API global
from version 88 https://bugzilla.mozilla.org/show_bug.cgi?id=1698158 ,
and experiments code doesn't have to import Services.jsm for recent versions.

Author: arai-a

src/api/experiments.js

@@ -3,7 +3,9 @@
 
 "use strict";
 
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+var Services = globalThis.Services || ChromeUtils.import(
+  "resource://gre/modules/Services.jsm"
+).Services;
 var { ExtensionSupport } = ChromeUtils.import(
   "resource:///modules/ExtensionSupport.jsm"
 );

src/content/customcol.js

@@ -3,7 +3,9 @@
 var { AppConstants } = ChromeUtils.import(
   "resource://gre/modules/AppConstants.jsm"
 );
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+var Services = globalThis.Services || ChromeUtils.import(
+  "resource://gre/modules/Services.jsm"
+).Services;
 
 const jalaliDateColumnHandler = {
   init(win) {