docs(providers): add Providers v2 guide #2511

Job	Run time
E2E / Enforce test:e2e runs when labeled	2s
GPU E2E / Enforce test:e2e-gpu runs when labeled	2s
Re-run gate in PR context	-1s
E2E / Enforce test:e2e runs when labeled	5s
GPU E2E / Enforce test:e2e-gpu runs when labeled	4s
Re-run gate in PR context	0s
	12s

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