making available required standard type parameters

[SteffenMeinecke]

• [CHANGED] required standard type parameters are made available by function required_std_type_parameters()

This PR is used in our pp2pf converter

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.61%. Comparing base (fc195fc) to head (f653064).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
pandapower/std_types.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2479   +/-   ##
========================================
  Coverage    75.61%   75.61%           
========================================
  Files          284      284           
  Lines        33802    33804    +2     
========================================
+ Hits         25558    25560    +2     
  Misses        8244     8244           

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