[wip] changing name from inner splitter to scoped splitter

[djarecka]

Types of changes

renaming variables

• updating code and tests
• add description to docs
• review container dim (?, possibly new PR)

Summary

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Attention: Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.81%. Comparing base (47c3958) to head (4055def).

Files with missing lines	Patch %	Lines
pydra/engine/node.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   87.89%   87.81%   -0.09%     
==========================================
  Files          84       84              
  Lines       17890    17890              
  Branches     3483     3483              
==========================================
- Hits        15725    15710      -15     
- Misses       1809     1824      +15     
  Partials      356      356              

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