Allow Gemini app integrations to directly act on specified sites

Allows to set a list of URL patterns that specify on which sites Gemini app integrations can directly act on web pages. URLs matching neither the allowlist or the blocklist use GeminiActOnWebSettings. URLs matching both the allowlist and the blocklist are allowed. For detailed information on valid url patterns, please see https://support.google.com/chrome/a?p=url_blocklist_filter_format. Example value: example.com https://ssl.server.com hosting.com/good_path https://server:8080/path .exact.hostname.com