Adding inputs lengths matching and solving a few minor issues/limitations of Mask Join node

Слиты nikitronn запросил слияние github/fork/ArpegorPSGH/mask_join_add_global_match в mask_join_match

Created by: ArpegorPSGH

Addressed problem description

This solves issue #4607 (closed). I also solved what looked like an issue and slightly expanded the node functionality.

Solution description

I added list length matching at each level in the inputs, while not changing the node treatment on the lists. In the get_level function, it seemed to me that the case >2 should instead be >= 2, otherwise the treatment is not consistent when you increase the number of levels. Finally, I enabled the use of the choice option when there is 0 nesting in the data input lists.

Preflight checklist

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Manual testing done.
  • Unit-tests implemented.
  • Ready for merge.