feat(server): websocket keep alive

[buraktt]

Closes #2822

🎯 Changes

Heartbeat logic is implemented to keep connection alive.

✅ Checklist

• ✅ I have followed the steps listed in the Contributing guide.
• ✅ If necessary, I have added documentation related to the changes made.
• ✅ I have added or updated the tests related to the changes made.

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[KATT]

Thanks for this!

Please use fake timers so the tests don't take over 3 seconds to run 🙏

[buraktt]

Thanks for this!

Please use fake timers so the tests don't take over 3 seconds to run 🙏

Thanks for the quick review. Changes implemented 👍

[KATT]

Thanks!

FYI we'll have support for SSE soon too which will be nicer to use than WSS. you can peek in #5713

[KATT]

Actually - one more thing - please add docs too! 🙏 Sorry I missed that was missing

[buraktt]

@KATT docs updated.
SSE looks promising 🚀

[BeBoRE]

Just for curiosity, when is this useful? Heartbeat is built into the WebSocket standard already.

[buraktt]

@BeBoRE this is useful when you need to keep connection open by utilizing ping/pong control messages from ws package. (or drop them in a reasonable time to release the used resources)

[BeBoRE]

Ohh, so heartbeat isn't done automatically? I thought the ws package would handle this automatically. My bad. Nice addition!

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