Add gated Gravity Index tool #6306

Job	Run time
build-and-check	2m 48s
test-integration-packages/internal	1m 11s
test-integration-common	41s
test-integration-cli	45s
test-integration-sdk	1m 23s
test-integration-web	40s
test-integration-packages/billing	1m 1s
test-cli	53s
test-packages/agent-runtime	47s
test-web	1m 8s
test-.agents	51s
test-packages/internal	50s
test-common	1m 0s
test-sdk	42s
test-packages/billing	39s
test-integration-packages/agent-runtime	43s
	16m 2s

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