storage: introduce CasManager to support chunk dedup at runtime #3222

Job	Run time
nydusd-build-macos (amd64)	2m 20s
nydusd-build-macos (arm64)	3m 11s
contrib-build (amd64)	25s
contrib-lint (contrib/nydusify)	52s
nydus-build (amd64)	3m 13s
contrib-build (arm64)	38s
contrib-lint (contrib/nydus-overlayfs)	20s
contrib-unit-test-coverage	18s
nydus-build (arm64)	4m 3s
contrib-build (ppc64le)	45s
nydus-build (ppc64le)	3m 3s
contrib-build (riscv64)	40s
nydus-build (riscv64)	2m 55s
cargo-deny	48s
nydus-unit-test	4m 56s
nydus-unit-test-coverage	3m 49s
upload-coverage-to-codecov	9s
takeover-test	1m 40s
nydus-integration-test	6m 33s
performance-test (fs-version-5)	1m 13s
performance-test (fs-version-6)	1m 20s
performance-test (zran)	1m 27s
	44m 38s

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