fix(hci): Check stop flag periodically, even without incoming data

[wwaaijer]

Fixes stoprocent/noble#30 and stoprocent/bleno#11.

This adds a read timeout to the HCI Linux socket using SO_RCVTIMEO (see socket(7)), allowing the poll thread to check the stop flag even when there is no activity on the socket.

Alternatives considered:

• Immediate socket close - couldn't guarantee pending commands reach the HCI device
• Explicit wait for specific response events - would require significant additional code in both Bleno's and Noble's clean up process

Happy to discuss or elaborate!

[fquirin]

I highly recommend to merge this PR. I've tested it on Raspberry Pi 4, OS 13 (Trixie) and it solved my issue with the unresponsive PollSocket thread.
As far as I understand the fix does not introduce any potential issues with other systems and is a "common" procedure on Linux (according to "AI" 😏).

[stoprocent]

can you rebase?

[wwaaijer]

Done ✅

[github-actions]

🎉 This PR is included in version 2.2.5 🎉

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