Support custom App Installer UI

[marcinotorowski]

Support for re-defining default style of the App Installer UI (win11 only)

[marcinotorowski]

Reference:
https://github.com/MicrosoftDocs/msix-docs/blob/d9c09b50827c1d87c6bdf8f50ac7df99645e47a1/msix-src/app-installer/How-to-create-custom-app-installer-ux.md