TAN Hotline no. not clickable (EXPOSUREAPP-2551) (#1193)

* Made hotline number clickable

- delcared textview clickable within xml layout
- reused dial logic from button and used for now clickable text

* removed synthetic import - now using binding instead.

Co-authored-by: Jakob Möller <jakob.moeller@sap.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>