toolbox and auxiliary functions

[SteffenMeinecke]

nothing special, just

• new little helper functionality
• kwargs in get_equivalent
• adaptions to apply pandas 2.2 FutureWarnings

[codecov]

Codecov Report

Attention: Patch coverage is 74.19355% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 79.43%. Comparing base (82a5a9b) to head (a25061c).

Files	Patch %	Lines
pandapower/auxiliary.py	13.33%	13 Missing ⚠️
pandapower/toolbox/element_selection.py	73.07%	7 Missing ⚠️
pandapower/toolbox/grid_modification.py	92.10%	3 Missing ⚠️
pandapower/grid_equivalents/auxiliary.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2211      +/-   ##
===========================================
- Coverage    79.46%   79.43%   -0.03%     
===========================================
  Files          255      255              
  Lines        27909    27947      +38     
===========================================
+ Hits         22177    22201      +24     
- Misses        5732     5746      +14     

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