Add place types

[nicksellen]

This is basically the same as #1122 but without changing anything about the place statuses. The aim is to reduce the complexity, so I can get something mergable sooner, and deal with any changes to the handling of statuses after that.

It adds a new model "place types" so we can have different types of place with their own icons (and in the future, perhaps behaviour).

There are more detailed thoughts about it on the community forum post --> https://community.foodsaving.world/t/custom-place-types/705/4

TODO

• vaguely check if the existing frontend will work out with this backend
• decide on initial place types

[codecov]

Codecov Report

Merging #1159 (5c087e9) into master (7004fe0) will increase coverage by 0.06%.
The diff coverage is 95.90%.

@@            Coverage Diff             @@
##           master    #1159      +/-   ##
==========================================
+ Coverage   93.56%   93.62%   +0.06%     
==========================================
  Files         484      493       +9     
  Lines       18466    18709     +243     
  Branches     1267     1279      +12     
==========================================
+ Hits        17278    17517     +239     
- Misses        956      957       +1     
- Partials      232      235       +3     

Impacted Files	Coverage Δ
karrot/activities/permissions.py	93.75% <ø> (+0.41%)	⬆️
...places/migrations/0035_add_standard_place_types.py	72.72% <72.72%> (ø)
karrot/places/permissions.py	84.21% <84.21%> (ø)
karrot/places/serializers.py	94.73% <93.18%> (-1.16%)	⬇️
karrot/places/models.py	97.91% <94.11%> (-2.09%)	⬇️
karrot/places/tests/test_place_types_api.py	97.91% <97.91%> (ø)
karrot/activities/filters.py	90.69% <100.00%> (+0.45%)	⬆️
...t/activities/migrations/0030_auto_20210714_2116.py	100.00% <100.00%> (ø)
karrot/activities/models.py	93.53% <100.00%> (-0.87%)	⬇️
karrot/activities/serializers.py	94.80% <100.00%> (+1.58%)	⬆️
... and 28 more

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[tiltec]

Seems good! I went over it and wrote some thoughts down, maybe it's helpful to you.

[nicksellen]

Yup, very helpful, thanks ⭐

Let's hope the tests are good enough to properly test the code changes from the review...