Add new `Rails/MultipleRoutePaths` cop #464

Job	Run time
Check the oldest supported RuboCop version	33s
Check documentation syntax	16s
Spec - JRuby	1m 54s
Spec - 2.7	31s
Prism	30s
Spec - 3.0	41s
Spec - 3.1	30s
Spec - 3.2	17s
Spec - 3.3	21s
Spec - 3.4	17s
Spec - head	16s
	6m 6s

Provide feedback