Provide static dmn analysis to detect anomalies

__Is your feature request related to a problem? Please describe__

Some issues in dmn decision tables can be identified even before execution. The DMN Testing Plugin should be able to detect such anomalies.

__Describe the solution you'd like__

A separate section in the plugin to perform static analysis.

It should identify anomalies like:
* Incomplete rules
* Conflicting rules
* Duplicate rules
* Correctly set up DRD
* ...

__Describe alternatives you've considered__

n/a
__Additional context__