Scheduler: use ConditionSet to store user-specified conds #1397

Job	Run time
select-runner	1s
build (3.7, x64, ubuntu)	57m 29s
build (3.7, x64, windows)	1h 3m 7s
build (3.11, x64, ubuntu)	1h 29m 46s
build (3.11, x64, macos)	59m 2s
build (3.11, x64, windows)	1h 37m 58s
build (3.9, macos, --cov=psyneulink)	1h 30m 31s
build (3.9, ubuntu, --forked -m "not llvm")	37m 47s
build (3.8, x86, windows)	1h 46m 7s
build (3.10, ubuntu, --fp-precision=fp32)	1h 23m 13s
build (3.10, macos, -m benchmark --benchmark-enable --benchmark-only --benchmark-min-rounds=2 --b...	1h 1m 40s
build (3.7, x64, ubuntu, min)	1h 0m 54s
build (3.8, x64, macos)	46m 51s
	14h 14m 26s

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