Add support for OneBot-11 protocol

[Gennadiyev]

AWA should be able to work as an OneBot client. Preliminary implementation target is to send HTTP requests to OneBot v11 servers.

This will indirectly add support for Discord, Lark and more.

Configuration format example (should be converted to YAML but I am a JSON nerd):

{
    "notifier": {
        "onebot-11": {
            "enabled": true,
            "access_token": "extra-secret~!", // ${ONEBOT_ACCESS_TOKEN}
            "to_group_ids": ["1016792818"],
            "to_friend_ids": ["2014709936"]
        }
    }
}

Relevant documentation:

• (Chinese (Simplified)) https://github.com/botuniverse/onebot-11/blob/master/communication/http.md
• (Chinese (Simplified)) https://github.com/botuniverse/onebot-11/blob/master/api/public.md
• https://onebots.pages.dev/en/protocol/onebot-v11/