Allow to create Dynamic Links with the "ofl" parameter

[giorgiofellipe]

As documented here https://firebase.google.com/docs/dynamic-links/create-manually the ofl parameter is The link to open on platforms beside Android and iOS. This is useful to specify a different behavior on desktop, like displaying a full web page of the app content/payload (as specified by param link) with another dynamic link to install the app..

It may be interesting when we want a specific web page to be opened on other platforms but keep the "open the App Store/Google Play pages" behavior on Android and iOS.

Maybe its a duplication of #4479. I'm sorry, found it right after posting this one, if you think it can be discussed there you can close this one.

Update:
As a workaround at the moment I'm creating a long link appending this parameter e creating a short link of this one.