Add a build-in database with application icons.

**Is your feature request related to a problem? Please describe.**

no

**Describe the solution you'd like**
It would be be nice if we can browse list of application icons. Lets say we create an new application, an choose from a drop-down menu. TOTP apps for android, for example AndOTP, do have this option.
Better, if we type the application name, Authentik can take the icon automatically, based on the name of the application. Would be nice to have the same resolution for all the apps.