nydusify: introduce chunkdict generate subcommand #2269

Job	Run time
contrib-build	2m 23s
contrib-build-master	2m 27s
nydus-build	1m 44s
cargo-deny	6m 7s
nydusd-build-macos (amd64)	3m 45s
nydus-build-master	1m 47s
nydus-unit-test	3m 53s
nydusd-build-macos (arm64)	3m 52s
nydus-unit-test-coverage	9m 36s
benchmark-nydus-all-prefetch	46s
benchmark-nydus-filelist-prefetch	2m 43s
benchmark-oci	1m 5s
benchmark-nydus-no-prefetch	28s
benchmark-zran-all-prefetch	1m 2s
benchmark-zran-no-prefetch	56s
nydus-integration-test	5m 48s
benchmark-nydus-filelist-prefetch-master	4m 4s
benchmark-nydus-no-prefetch-master	31s
benchmark-nydus-all-prefetch-master	42s
benchmark-zran-all-prefetch-master	1m 4s
benchmark-zran-no-prefetch-master	45s
benchmark-result	0s
benchmark-compare	7s
	55m 35s

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