Refactor Timers to behave more similarly to Immediates by having
a single uv_timer_t handle which is stored on the Environment.
No longer expose timers in a public binding and instead make
it part of the internalBinding.
PR-URL: https://github.com/nodejs/node/pull/20894
Fixes: https://github.com/nodejs/node/issues/10154
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
