feat: Support for icloud.com.cn

[gutenye]

tACK, works in China, but needs this

diff --git a/src/manifest.json b/src/manifest.json
index 74aba60..1706c4c 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -32,7 +32,7 @@
     "webRequest",
     "notifications"
   ],
-  "host_permissions": ["https://*.icloud.com/*"],
+  "host_permissions": ["https://*.icloud.com/*", "https://*.icloud.com.cn/*"],
   "icons": {
     "16": "icon-16.png",
     "32": "icon-32.png",

[dedoussis]

@gutenye have addressed both of your comments (thank you!) + did some refactoring. Would you mind testing this again to make sure that my new changes work with CN appleId's?

[gutenye]

Tested, works great!

[dedoussis]

thank you @gutenye!