Short description

This PR improves routes and screens naming across the app for better clarity and to avoid wrong imports.

List of changes proposed in this pull request

• Add prefix for each screen and route of the pid issuance flow to avoid confusing them with the ones for a generic credential implemented in feat: [EUDIW-206] Add generic credential issuance #50;
• Add NAV suffix to screens which contain a navigator to better differentiate them.
• Change the route name for the main navigation which was wrongly referring to the tab navigator.

How to test

Static checks should be enough but check if there's any regression in the pid issuance flow.