Add Layout/IndentationConsistency to Rubocop config #1760

Job	Run time
RuboCop	26s
specs (ubuntu, 3.0.6)	1m 37s
specs (ubuntu, 3.1.4)	1m 37s
specs (ubuntu, 3.2.2)	1m 30s
specs (ubuntu, 3.3.0)	1m 30s
specs (macos, 3.0.6)	1m 21s
specs (macos, 3.1.4)	1m 20s
specs (macos, 3.2.2)	1m 9s
specs (macos, 3.3.0)	1m 8s
specs (windows, 3.0.6)	4m 5s
specs (windows, 3.1.4)	4m 56s
specs (windows, 3.2.2)	4m 29s
specs (windows, 3.3.0)	6m 11s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 30s
	32m 49s

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