transaction: Move flatpakref installation to transaction code

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This adds the flatpak_transaction_add_install_flatpakref method
to easily install from flatpakref files. It additionally
adds a new signal called add-new-remote which is called in two
cases:

 To ask if the user wants to add a "normal" remote for the url
 specified by a flatpakref file.

 When a new remote is required for the runtimes the application
 depends on.

Closes: #1868
Approved by: alexlarsson

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