feat: support scoping plugins to consumer-groups #1915

Job	Run time
integration (kong:1.4.3)	1m 29s
integration (kong:1.5.1)	1m 28s
integration (kong:2.0.5)	1m 24s
integration (kong:2.1.4)	1m 21s
integration (kong:2.2.2)	1m 26s
integration (kong:2.3.3)	1m 48s
integration (kong:2.4.1)	1m 28s
integration (kong:2.5.1)	1m 26s
integration (kong:2.6.0)	1m 33s
integration (kong:2.7)	1m 35s
integration (kong:2.8)	1m 15s
integration (kong:3.0)	1m 21s
integration (kong:3.1)	1m 27s
integration (kong:3.2)	1m 37s
integration (kong:3.3)	1m 37s
integration (kong/kong:master-alpine)	1m 27s
	23m 42s

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