When will support for Feishu/Lark channels be available in webSocket ？

[aluenkinglee]

Description

I looked at the source code in crates/openfang-channels/src/feishu.rs and noticed it currently uses webhook mode. This approach has some inconveniences—for example, it requires a public domain and server, which adds some cost. So I'm exploring whether we can support long-connection-based event callbacks instead (see: https://open.feishu.cn/document/server-docs/server-side-sdk).

Alternatives Considered

No response

Additional Context

No response