add configuration switch to disable fallback to root directory (3.x)

[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 (a137c79) 80.12% compared to head (199d73a) 79.33%.

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

Additional details and impacted files

@@             Coverage Diff              @@
##                3.x      #87      +/-   ##
============================================
- Coverage     80.12%   79.33%   -0.79%     
- Complexity      146      148       +2     
============================================
  Files            33       33              
  Lines           654      663       +9     
  Branches         64       64              
============================================
+ Hits            524      526       +2     
- Misses          104      111       +7     
  Partials         26       26              

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