add configuration switch to disable fallback to root directory

[purnhar]

Summary

Skip analysis for projects without source files

Details

If no source files are found in a module of a multi module project, no analysis should be done (e.g. in modules which just assemble war files or docker images). Therefor a the configuration property fallbackToRootDirectory is added to disable the current default behavior.

Context

Feature is needed in bigger Maven multi module projects.

Checklist:

• I've added tests for my code.
• Documentation has been updated accordingly to this PR

Related issue :

societe-generale/arch-unit-maven-plugin#66

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c3bdbe4) 79.96% compared to head (16f129f) 79.18%.

Files	Patch %	Lines
...ale/commons/plugin/service/RuleInvokerService.java	22.22%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #88      +/-   ##
============================================
- Coverage     79.96%   79.18%   -0.79%     
- Complexity      145      147       +2     
============================================
  Files            33       33              
  Lines           654      663       +9     
  Branches         65       65              
============================================
+ Hits            523      525       +2     
- Misses          104      111       +7     
  Partials         27       27              

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