[Bug]: SSE comments cause client to crash #540
Description
Is your feature request related to a problem? Please describe.
Long-lived connections where events are not sent regularly might be terminated due to inactivity.
It's a common practice to implement SSE keep-alive messages by sending "a comment".
https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#examples
This was implemented in Golang SDK, but we got a report about this causing problems with python clients:
a2aproject/a2a-go#99
Describe the solution you'd like
SSE client should be capable of parsing SSE stream which has comments in it. Lines prefixed with a colon should be ignored.
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