Add api to trigger App-to-web education

Some applications will want to control when the App-to-web education
should be shown based on the satte of the application and whether the
web will provide the user will a better experience. This api allows
activities to request for the education to be shown.

Test: m
Bug: 373680430
API-Coverage-Bug: 376903053
Flag: com.android.window.flags.enable_desktop_windowing_app_to_web_education
Change-Id: Iba51662825b7272711792422c7cc5a002009915f