http: replace WorkQueue and threads handling for ThreadPool #874

Job	Run time
determine runners	2s
Windows native, VS 2022	53m 29s
Windows native, fuzz, VS 2022	35m 47s
macOS native, fuzz	11m 52s
macOS native, no depends, sqlite only, gui	31m 10s
test each commit	0s
lint	5m 1s
Linux->Windows cross, no tests	31m 28s
32 bit ARM, unit tests, no functional tests	22m 34s
ASan + LSan + UBSan + integer, no depends, USDT	1h 35m 26s
macOS-cross to arm64	49m 11s
No wallet, libbitcoinkernel	32m 12s
no IPC, i686, DEBUG	54m 50s
fuzzer,address,undefined,integer, no depends	2h 10m 47s
TSan, depends, no gui	57m 39s
macOS-cross to x86_64	51m 43s
previous releases, depends DEBUG	38m 21s
tidy	1h 30m 0s
MSan, depends	1h 21m 32s
Alpine (musl), depends, gui	1h 1m 21s
Windows, test cross-built	43m 9s
	16h 17m 34s

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