Vaccination QR code scan screen, error handling, navigation (EXPOSUREAPP-6726) (#3124)

* extractor

* decoding

* decoding, error handling

* clean up

* klint

* detekt

* simplify condition

* comment failing unit test

* unit test

* change lib

* Unit tests for RA/PCRCoronaTest.isFinal

* Add license text.

* add header

* clean up

* scan screen, error handling, navigation

* clean up

* klint detekt

* merge

* move strings

* comments

* klint

* revert version change

* fix fun name

* fix merge conflicts

* show dialog

* add navigation

* fix error dialog

* fix error dialog

* fix error dialog

* fix error dialog

* simplify

* merge main

* fix package

* review comments

* circular progress spinner

* fix test

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>