Vaccination Server - Retrofit interfaces & Module  (EXPOSUREAPP-6854, EXPOSUREAPP-6856, EXPOSUREAPP-7129) (#3099)

* Create some classes

* Get vaccination urls from env json

* Implemented api for obtaining value sets

* improved package structure, merge adjustments

* Adjusted path

* Share cache so one can clean it

* Added certificate retrofit

* Correction

* satisfy CI

* clean import

* fix test

* Fix test #2

* Dont use retrofit cache for more control

* Revert "Dont use retrofit cache for more control"

This reverts commit 44fed1f6d5258c00f1a5db72a329cfb91b6c60fa.

* Renamed vaccination url, Adjusted test

* Update prod json

* Changed name

* Updated debug menu

* Added new optional api

* Update DebugOptionsFragmentViewModelTest.kt

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>