Standalone `gz log` executable #142

Job	Run time
test / matrix-prep-os	3s
test / matrix-prep-bazelversion	7s
test / test (ubuntu-latest, 7.3.1, ., true)	13m 16s
test / test (ubuntu-latest, 8.0.0, ., true)	13m 5s
	26m 31s

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