V2 Configuration Options for Risk Calculation (EXPOSUREAPP-5217) (#2512)

* Drop exposure window when no risklevel is associated - wip

* improved logging in DefaultRiskLevels

* Adapted new trasmission risk level calc

* Added placeholder for transmission risk value mapping

* Adjusted calculation test, updated test data

* Updated path for appconfig v2

* Replaced Transmission Risk Level Multiplier with Transmission Risk Value Mapping

* cleanUp

* Use protobufs

* better readable risk calculation parameters

* Updated default config

* adjusted tests

* Return null instead of throwing an exception

* Removed obsolete exceptions

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