feat: cross-platform force-kill primitive for stuck PHP threads #4655

Job	Run time
prepare	13s
Build macOS arm64 binaries	33m 26s
Build macOS x86_64 binaries	1h 0m 32s
Build linux/amd64 static GNU binary	41m 26s
Build linux/arm64 static GNU binary	33m 51s
Build linux/amd64 static musl binary (debug)	23m 52s
Build linux/amd64 static musl binary (mimalloc)	27m 50s
Build linux/amd64 static musl binary	27m 50s
Build linux/arm64 static musl binary	24m 23s
push	0s
	4h 33m 23s

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