[#1394] Add banner plugin

[vaszig]

No description provided.

[codecov-commenter]

Codecov Report

Merging #592 (a1697ae) into develop (d60b7b0) will decrease coverage by 0.01%.
The diff coverage is 91.66%.

@@             Coverage Diff             @@
##           develop     #592      +/-   ##
===========================================
- Coverage    96.17%   96.16%   -0.01%     
===========================================
  Files          564      568       +4     
  Lines        19795    19831      +36     
===========================================
+ Hits         19037    19070      +33     
- Misses         758      761       +3     

Impacted Files	Coverage Δ
src/open_inwoner/conf/base.py	95.37% <ø> (ø)
src/open_inwoner/configurations/models.py	97.61% <ø> (ø)
src/open_inwoner/cms/banner/cms_plugins.py	83.33% <83.33%> (ø)
src/open_inwoner/cms/banner/models.py	88.88% <88.88%> (ø)
...open_inwoner/cms/banner/migrations/0001_initial.py	100.00% <100.00%> (ø)
...s/0039_alter_siteconfiguration_hero_image_login.py	100.00% <100.00%> (ø)

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