feat: Add command to dump cbor hex of block #250

Job	Run time
Build (macos-latest, macos, aarch64-apple-darwin, nightly)	5m 22s
Build (windows-latest, windows, x86_64-pc-windows-msvc, nightly)	7m 26s
Build (ubuntu-22.04, ubuntu22, x86_64-unknown-linux-musl, true, nightly)	5m 11s
Build (ubuntu-22.04, ubuntu22, x86_64-unknown-linux-gnu, nightly)	4m 47s
	22m 46s

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