Feat: Add onebot v11 notify

[ExplodingDragon]

Add Tencent QQ support for Alertmanager (using OneBot ,this is just a compatible solution, as Tencent QQ's official bot API has limitations on active message push. )

Note: Since OneBot is not an official API of Tencent QQ, this PR should never be merged.

example:

receivers:
  - name: 'onebot'
    onebot_configs:
      - api_url: http://<onebot addr>
        http_config:
          authorization:
            credentials: "token"
        to_user: "user"
        to_party: "group"
        send_resolved: true