Add gated Gravity Index tool #6310

Job	Run time
build-and-check	3m 2s
test-integration-packages/internal	1m 4s
test-integration-packages/billing	1m 3s
test-integration-common	45s
test-integration-cli	45s
test-integration-packages/agent-runtime	39s
test-integration-web	50s
test-integration-sdk	2m 58s
test-packages/billing	39s
test-cli	1m 3s
test-sdk	41s
test-packages/internal	51s
test-.agents	48s
test-packages/agent-runtime	47s
test-common	44s
test-web	1m 10s
	17m 49s

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