Refactor open-api generation.

[rush42]

This PR refactors the open-api generation for /api/fahrradparken and applies the following changes:

• excludes the /api/fahrradparken/uuid/* routes from the open api docs
• rewrite /api/fahrradparken/stations/{id} as a RetrievAPIView class

Related PR in fixmy.fahrradparken.

[codecov[bot]]

Codecov Report

Merging #719 (ea25e0d) into develop (5a08493) will decrease coverage by 0.01%. The diff coverage is 74.19%.

@@             Coverage Diff             @@
##           develop     #719      +/-   ##
===========================================
- Coverage    86.06%   86.04%   -0.02%     
===========================================
  Files          219      220       +1     
  Lines         5383     5369      -14     
===========================================
- Hits          4633     4620      -13     
+ Misses         750      749       -1     

Impacted Files	Coverage Δ
fahrradparken/openapi.py	27.27% <27.27%> (ø)
fahrradparken/models.py	96.23% <100.00%> (ø)
fahrradparken/serializers.py	94.40% <100.00%> (-0.14%)	:arrow_down:
fahrradparken/urls.py	100.00% <100.00%> (+45.00%)	:arrow_up:
fahrradparken/views.py	85.92% <100.00%> (-1.15%)	:arrow_down:

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[rush42]

We're shutting this task down, because it would require heavy changes over the whole fahrradparken project. See the corresponding frontend issue for more details