FR: Resolve dynamiclink to deep link by API

### Feature proposal

* Firebase Component: DynamicLinks

We embed DynamicLinks in QR codes to deep link users to specific pages or components in our app. This works fine when the user scans the QR code via their camera app. The browser opens the DynamicLink, resolves it's associated DeepLink, and passes it along to our app which can then decode the query and find our custom parameter.

The app we develop also contains a QR code scanner which can recognise the same QR codes and decode it to get the dynamic link. We would like to be able to resolve the DeepLink from the DynamicLink by an API from within our app, instead of opening the DynamicLink in a browser only for it to then guide us straight back to our app.

The request concerns Firebase DynamicLinks in a Unity app, but names no repository file, test, or entry point. First verify whether Firebase Dynamic Links exposes a supported resolution API for Unity and identify the relevant sample or SDK entry point. Done means a scanned Dynamic Link can be resolved in-app to its associated deep link and custom parameters without opening a browser.

Written by the indexing model from the issue text.