Add `pczt inspect` command #224

Job	Run time
Rustfmt	5s
Clippy	1m 29s
Build latest on ubuntu-latest	2m 24s
Build on ubuntu-latest	2m 24s
Build latest on windows-latest	4m 44s
Build on windows-latest	6m 19s
Build latest on macOS-latest	2m 0s
Build on macOS-latest	2m 10s
	21m 35s

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