feat: rename state dir .kq to .kqs with legacy migration #9

Job	Run time
build-and-test (ubuntu-24.04, x86_64-unknown-linux-gnu)	39s
build-and-test (macos-latest, aarch64-apple-darwin)	55s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	1m 22s
	2m 56s

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