Create Event/Location Flow (EXPOSUREAPP-5720) (#2664)

* Create Event/Location Flow Implementation

* Update Event/Location Flow Implementation

* Lint format

* Code format fix

* Update nav_graph

* Update DatePicker behaviour

* Update layout

* Hide keyboard when navigating back

* Update strings

* Small design fixes

* Remove bold text

* Keep form values

* Add TraceLocationCreateViewModelTest unit test

* Small changes

* Code refactoring

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Lukas Lechner <lukas.lechner@sap.com>