Add Stoppable trait to State which exposes an API to stop the fuzzer #11015

Job	Run time
android	52s
cargo-fmt	50s
build-docker	1m 3s
common (ubuntu-latest)	1m 0s
changes	4s
common (windows-latest)	47s
Simple build in FreeBSD	49s
fuzzers-preflight	3s
common (macOS-latest)	1m 5s
ios	1m 4s
llvm-tester (16)	48s
macos	1m 1s
llvm-tester (17)	48s
nostd-build	34s
nostd-clippy	33s
python-bindings	48s
ubuntu	47s
ubuntu-clippy	47s
ubuntu-doc-build	48s
ubuntu-doc-test	46s
fuzzers-qemu	0s
fuzzers	1s
ubuntu-check	1s
ubuntu-concolic	1s
ubuntu-miri	1s
windows-frida-gdiplus	1s
windows-frida-libfuzzer-stb-image	1s
windows-frida-libpng	1s
windows-clippy	1s
windows-tinyinst-simple	1s
	15m 26s

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