Add read_url tool for web research #779

Job	Run time
build-and-smoke-freebuff-windows	2m 14s
build-freebuff	1m 26s
e2e-version	1m 6s
e2e-startup	1m 22s
e2e-agent-startup	2m 26s
e2e-ads-behavior	1m 9s
e2e-slash-commands	1m 1s
e2e-help-command	1m 7s
e2e-code-edit	1m 1s
e2e-terminal-command	54s
	13m 46s

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