create_feishu_webhook_handler: Create a Feishu Webhook Handler
Description
Create a transport-agnostic handler that turns a raw Feishu callback request
into a JSON HTTP response payload.
Usage
create_feishu_webhook_handler(runtime)
Value
A function (headers, body) that returns a response list.
Arguments
- runtime
A ChannelRuntime with a Feishu adapter registered.