Feature/branch parallel to substation

[SteffenMeinecke]

• is based on add tollbox function get_substations that finds clusters of connected… #2177 and [ADDED] toolbox functions  #2176
• it can be discussed whether branches_parallel_to_bus_bus_switches() and check_parallel_branch_to_bus_bus_switch() are still needed and if not whether branches_parallel_to_bus_bus_switch_clusters() should be renamed

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (6380a30) 79.65% compared to head (428c81f) 79.67%.

Files	Patch %	Lines
pandapower/toolbox/element_selection.py	91.52%	5 Missing ⚠️
pandapower/topology/create_graph.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2178      +/-   ##
===========================================
+ Coverage    79.65%   79.67%   +0.02%     
===========================================
  Files          255      255              
  Lines        27795    27853      +58     
===========================================
+ Hits         22139    22193      +54     
- Misses        5656     5660       +4     

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[SteffenMeinecke]

this PR can be closed if more advanced code on substations are provided by @ascheidl