Add read_url tool for web research (#719) #6708

Job	Run time
build-and-check	3m 6s
test-integration-packages/billing	1m 18s
test-integration-packages/agent-runtime	41s
test-integration-cli	47s
test-integration-common	49s
test-integration-sdk	1m 55s
test-cli	1m 0s
test-packages/agent-runtime	47s
test-packages/billing	41s
test-web	58s
test-.agents	44s
test-sdk	48s
test-packages/internal	55s
test-integration-web	53s
test-common	41s
test-integration-packages/internal	1m 7s
	17m 10s

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