Fix potential race conditions when cancelling read/write idle timers #720
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Motivation
This PR is a follow-up to #718. It applies the same modifications done in #455 to the HTTP2 request handler to avoid a race condition when cancelling idle timers.
Modifications
A new timer ID for each timer (read and write idle timeouts) has been added to keep track of the current idle timers, just like it's done in the HTTP1 implementation.
Result
No more race conditions when cancelling timers in HTTP2.