Extract Renderable interfaces to module #1544

Job	Run time
rubocop	14s
tests (ubuntu-latest, 2.7)	15m 5s
tests (ubuntu-latest, 3.0)	8s
tests (ubuntu-latest, 3.1)	8s
tests (ubuntu-latest, 3.2)	8s
tests (ubuntu-latest, head)	9s
tests (ubuntu-latest, truffleruby-22.2)	35s
tests (ubuntu-latest, truffleruby-22.3)	34s
tests (ubuntu-latest, truffleruby-head)	28s
tests (macos-latest, 2.7)	26m 49s
tests (macos-latest, 3.0)	20s
tests (macos-latest, 3.1)	19s
tests (macos-latest, 3.2)	30s
tests (macos-latest, head)	42s
tests (macos-latest, truffleruby-22.2)	51s
tests (macos-latest, truffleruby-22.3)	1m 2s
tests (macos-latest, truffleruby-head)	54s
	48m 56s

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