Collection: add Variables field to interact with global variables #1369

Job	Run time
Build Documentation	26s
Build and Lint	2m 9s
Run tests on previous stable Go	2m 13s
Run tests on arm64	35s
Run tests (mainline)	1m 7s
Run tests (stable)	1m 5s
Run tests (6.6)	1m 6s
Run tests (6.1)	59s
Run tests (5.15)	1m 4s
Run tests (5.10)	1m 10s
Run tests (5.4)	1m 22s
Run tests (4.19)	1m 20s
Run tests (4.14)	1m 3s
Run tests (4.9)	1m 25s
	17m 4s

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