Standalone `gz log` executable #159

Job	Run time
test / matrix-prep-os	2s
test / matrix-prep-bazelversion	5s
test / test (ubuntu-latest, 8.0.0, ., true)	13m 35s
test / test (ubuntu-latest, 7.3.1, ., true)	13m 13s
	26m 55s

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