added new Validator module for general purpose validation of node values against an ADT

[jurgenvinju]

[jurgenvinju]

this depends on #1502 to be solved, because we don't accept static type errors in the standard library anymore.

[jurgenvinju]

This [ERROR]:

https://github.com/usethesource/rascal/runs/2745706968?check_suite_focus=true#step:5:752

is caused by #issue 1502. No rush but when that is finished we can merge this PR.

[codecov[bot]]

Codecov Report

Merging #1503 (fd1471f) into main (db65c25) will not change coverage. The diff coverage is n/a.

:exclamation: Current head fd1471f differs from pull request most recent head 265f7cd. Consider uploading reports for the commit 265f7cd to get more accurate results

@@           Coverage Diff           @@
##              main   #1503   +/-   ##
=======================================
  Coverage       48%     48%           
  Complexity    5983    5983           
=======================================
  Files          670     670           
  Lines        58370   58370           
  Branches      8500    8500           
=======================================
  Hits         28412   28412           
+ Misses       27824   27823    -1     
- Partials      2134    2135    +1     

Impacted Files	Coverage Δ
...g/rascalmpl/interpreter/result/DateTimeResult.java	15% <0%> (-1%)	:arrow_down:
src/org/rascalmpl/interpreter/result/Result.java	14% <0%> (+<1%)	:arrow_up:

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