Accessibility: Statistics Blocks Enhancements (EXPOSUREAPP-4845) (#2256)

* added announcements for individual statistics

* added speech output for individual information on key submission statistics card

* enhanced speech output for InfectionsCard

* updated speech output for statistics incidence card

* removed typo

* updated speech output for seven day r value card

* enhanced speech output to announce complete cord when focusing it

* linting

* fixed announcement issue on some phones

* linting

* removed test transations

* changed accessibility string creation to string builder

* changed terminology

* used extension functions for more comprehensive code

* linting max lines

* updated string on seven day r value card

* renamed extension method

* linting max lines

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: BMItter <46747780+BMItter@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>