Rewrite the `dolt show` implementation. #14105

Job	Run time
Go tests (macos-latest)	8m 23s
Go tests (ubuntu-22.04)	29m 16s
Go tests (windows-latest)	21m 44s
Go tests - no race (macos-latest)	2m 14s
Go tests - no race (ubuntu-22.04)	2m 12s
Go tests - no race (windows-latest)	3m 46s
	1h 7m 35s

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