Extract path config-based classpath computation

[toinehartman]

Extract/unify computation of a class path given a path config.

This code can also be used to simplify class path computations in the following PRs:

• Remove std scheme rascal-language-servers#1159
• [POM-leading for DSLs] Server lifetime, bugs and simplification rascal-language-servers#1156

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 46%. Comparing base (93c9482) to head (40364f8).

Files with missing lines	Patch %	Lines
src/org/rascalmpl/shell/ShellEvaluatorFactory.java	85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2847   +/-   ##
=======================================
  Coverage       45%     46%           
- Complexity    6751    6758    +7     
=======================================
  Files          841     841           
  Lines        67062   67066    +4     
  Branches     10021   10021           
=======================================
+ Hits         30847   30865   +18     
+ Misses       33839   33829   -10     
+ Partials      2376    2372    -4     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud