Cast numpy to torch in _resolve_indexing_state

[brownbaerchen]

Part one of unifying the treatment of different types of array keys.
Part two will be casting torch tensors to heat dndarray.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.39%. Comparing base (76c5c85) to head (a247b84).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
heat/core/dndarray.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                           @@
##           914_adv-indexing-outshape-outsplit    #2369      +/-   ##
======================================================================
+ Coverage                               91.38%   91.39%   +0.01%     
======================================================================
  Files                                      87       87              
  Lines                                   14884    14880       -4     
======================================================================
- Hits                                    13602    13600       -2     
+ Misses                                   1282     1280       -2     

Flag	Coverage Δ
unit	91.39% <85.71%> (+0.01%)	⬆️

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