Add gated Gravity Index tool #6319

Job	Run time
build-and-check	2m 52s
test-integration-packages/internal	1m 5s
test-integration-packages/billing	1m 7s
test-integration-web	50s
test-integration-common	43s
test-integration-cli	47s
test-integration-sdk	1m 17s
test-cli	57s
test-packages/billing	51s
test-.agents	52s
test-packages/agent-runtime	44s
test-sdk	59s
test-web	1m 1s
test-integration-packages/agent-runtime	43s
test-common	56s
test-packages/internal	46s
	16m 30s

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