Add Link to redirect to external pages or parent app

[wangxin688]

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Is your feature related to a problem? Please describe.

Use case: sqladmin is built on top of starlette and when it's mounted to fastapi as a sub-app, sqladmin can share the same session middleware with fastapi app, fastapi can add a redirect route page to admin page. But seems there's no way to redirect back to fastapi home page in Admin. Even I define custom views or pages it's not work.
So if aLink(external_url="/home") or Link(external_url="https://absolute.path.com")model can be register to Admin will be helpful.

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[mmzeynalli]

Could you please eloberate? I have overriden _build_url_for or _url_for_details_with_prop (especially for view button) to redirect to original website by giving full url