Allow changing the requested domain name for Telegram notifications, or allow it to use proxy

[Lemonawa]

📑 I have found these related issues/pull requests

N/A :D

🏷️ Feature Request Type

Change to existing notification-provider

🔖 Feature description

Due to the block of GFW, we are unable to access api.telegram.org.
However, we can use reverse proxy to access it, like tgapi.lma.moe.

✔️ Solution

like https://github.com/whyour/qinglong

❓ Alternatives

No response

📝 Additional Context

No response

[CommanderStorm]

Closing as a duplicate

Allowing for proxying of notifications is tracked in

• Notifications via proxy #616
• Notifications via a proxy (squid) #2588

TL;DR: We'd love for such a functionality to be contributed, but given the other things currently going on like #4500 don't quite have the engineering resources to do so
=> If you want to get there faster, help would be appreciated ^^