Add support for sibling projects in the maven resolver

[jurgenvinju]

This fixes #2614 by implementing an extension of the maven resolver that can locate sibling projects

[codecov]

Codecov Report

❌ Patch coverage is 69.69697% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 46%. Comparing base (756f5be) to head (457fcc5).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/org/rascalmpl/util/maven/SiblingResolver.java	72%	4 Missing and 2 partials ⚠️
src/org/rascalmpl/library/util/PathConfig.java	0%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2615   +/-   ##
=======================================
- Coverage       46%     46%   -1%     
- Complexity    6646    6658   +12     
=======================================
  Files          793     794    +1     
  Lines        65697   65746   +49     
  Branches      9839    9852   +13     
=======================================
+ Hits         30616   30634   +18     
- Misses       32720   32752   +32     
+ Partials      2361    2360    -1     

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