Add Stoppable trait to State which exposes an API to stop the fuzzer #11072

Job	Run time
build-docker	48s
android	47s
cargo-fmt	36s
changes	5s
Simple build in FreeBSD	34s
common (ubuntu-latest)	47s
common (windows-latest)	33s
common (macOS-latest)	49s
fuzzers-preflight	2s
llvm-tester (16)	32s
ios	49s
llvm-tester (17)	34s
macos	46s
nostd-build	44s
nostd-clippy	41s
python-bindings	32s
ubuntu	33s
ubuntu-clippy	33s
ubuntu-doc-build	41s
ubuntu-doc-test	43s
fuzzers-qemu	0s
fuzzers	1s
ubuntu-concolic	1s
ubuntu-check	1s
ubuntu-miri	1s
windows-frida-libfuzzer-stb-image	1s
windows-frida-gdiplus	1s
windows-frida-libpng	1s
windows-clippy	1s
windows-tinyinst-simple	1s
	12m 18s

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