add callback option to client service to track login state

[koho]

WHY

When using frp as library, I want to check if the connection between frpc and frps is working properly.

In most cases, we can determine that by the proxy status, for example, if the login was unsuccessful, the API /api/status will respond with an empty object. However, this method is not working if no proxy is provided in the config.

It would be great if a callback function could be added to client service to allow users to track the login state. I'm not sure this single callback function is sufficient to cover common use cases. If we should do more work, I think we can add more callbacks, such as on_connect(msg.LoginResp), on_connect_fail and on_disconnect. In my opinion, since we currently don't have error codes defined in login response, the callback function on_connect(msg.LoginResp) may be replaced with on_connect(bool). As for the callback on_connect_fail, it may not be commonly used.

[github-actions]

PRs go stale after 14d of inactivity. Stale PRs rot after an additional 3d of inactivity and eventually close.

[lingchenma]

Extend life

[github-actions]

PRs go stale after 14d of inactivity. Stale PRs rot after an additional 3d of inactivity and eventually close.

[coderabbitai]

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