Add Layout/IndentationConsistency to Rubocop config #1762

Job	Run time
RuboCop	29s
specs (ubuntu, 3.0.6)	1m 40s
specs (ubuntu, 3.1.4)	1m 33s
specs (ubuntu, 3.2.2)	1m 29s
specs (ubuntu, 3.3.0)	1m 29s
specs (macos, 3.0.6)	1m 42s
specs (macos, 3.1.4)	1m 31s
specs (macos, 3.2.2)	1m 9s
specs (macos, 3.3.0)	1m 11s
specs (windows, 3.0.6)	5m 40s
specs (windows, 3.1.4)	5m 14s
specs (windows, 3.2.2)	4m 3s
specs (windows, 3.3.0)	6m 22s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 29s
	35m 1s

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