storage: introduce CasManager to support chunk dedup at runtime #3304

Job	Run time
contrib-unit-test-coverage	1m 6s
contrib-lint (contrib/nydusify)	1m 2s
nydus-build (amd64)	2m 39s
contrib-lint (contrib/nydus-overlayfs)	22s
contrib-build (amd64)	27s
cargo-deny	45s
nydus-build (arm64)	2m 34s
contrib-build (arm64)	38s
nydus-build (ppc64le)	2m 15s
contrib-build (ppc64le)	39s
nydusd-build-macos (amd64)	3m 14s
nydus-build (riscv64)	2m 12s
contrib-build (riscv64)	41s
nydus-unit-test	4m 36s
nydusd-build-macos (arm64)	2m 53s
nydus-unit-test-coverage	3m 45s
performance-test (fs-version-5)	1m 57s
takeover-test	2m 4s
nydus-integration-test	2m 28s
performance-test (fs-version-6)	1m 48s
performance-test (zran)	1m 35s
upload-coverage-to-codecov	14s
	39m 54s

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