feat(backend-native): Allow importing modules from python files within cube.py and globals.py

[KSDaemon]

This fix allows to import python modules from files relative to cube.py. See more info and issue description in #8443.

Closes #8443

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.27%. Comparing base (940c30f) to head (3c79f20).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9490      +/-   ##
==========================================
- Coverage   80.28%   80.27%   -0.01%     
==========================================
  Files         395      395              
  Lines       97355    97355              
  Branches     2278     2278              
==========================================
- Hits        78158    78150       -8     
- Misses      18889    18897       +8     
  Partials      308      308              

Flag	Coverage Δ
cube-backend	57.50% <ø> (ø)
cubesql	83.93% <ø> (-0.01%)	⬇️

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[ovr]

LGTM with minor nit.