Collection: add Variables field to interact with global variables #1367

Job	Run time
Build Documentation	15s
Build and Lint	2m 11s
Run tests on previous stable Go	2m 5s
Run tests (mainline)	1m 7s
Run tests on arm64	37s
Run tests (stable)	1m 6s
Run tests (6.6)	1m 24s
Run tests (6.1)	1m 1s
Run tests (5.15)	1m 10s
Run tests (5.10)	1m 4s
Run tests (5.4)	1m 2s
Run tests (4.19)	1m 9s
Run tests (4.14)	1m 9s
Run tests (4.9)	1m 2s
	16m 22s

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