Add EventLoop APIs for simpler scheduling of callbacks #214

Job	Run time
Soundness / Documentation check	49s
Soundness / Broken symlinks check	3s
Checks / Integration Tests / 5.8	12m 50s
Soundness / API breakage check	2m 38s
Checks / Integration Tests / 5.9	14m 30s
Soundness / Format check	48s
Soundness / License headers check	8s
Checks / Integration Tests / 5.10	14m 22s
Soundness / Shell check	6s
Checks / Integration Tests / nightly-6.0	17m 4s
Soundness / Unacceptable language check	4s
Checks / Integration Tests / nightly-main	18m 7s
Checks / Benchmarks / 5.8	2m 49s
Checks / Benchmarks / 5.9	3m 55s
Checks / Benchmarks / 5.10	3m 33s
Checks / Benchmarks / nightly-6.0	4m 28s
Checks / Benchmarks / nightly-main	4m 43s
Checks / Cxx interop / 5.8	1m 10s
Checks / Cxx interop / 5.9	1m 15s
Checks / Cxx interop / 5.10	1m 5s
Checks / Cxx interop / nightly-6.0	1m 47s
Checks / Cxx interop / nightly-main	1m 48s
Checks / Unit tests / 5.8	1m 46s
Checks / Unit tests / 5.9	3m 16s
Checks / Unit tests / 5.10	3m 26s
Checks / Unit tests / nightly-6.0	4m 15s
Checks / Unit tests / nightly-main	4m 11s
	2h 4m 56s

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