Use pg_trgm to save product with correct brand or brand with correct corporation

[5h3rr1ll]

Describe the bug
Sometimes brand names are slightly different from the correct form or the name-string is combined with a comma and additional information. In that case, a new brand or a new corporation gets created which is not connected/related to any corporation or brand.

Expected behavior
We should use the same logic as we already use for the is_big_ten feedback, that we search for quite similar brands or corporations if we don't get a result right away.
I would say first try should be a clear get like Brand.objecs.get(name="coca cola") if that throws an error, we can try to find it like Brand.objects.filter(name__trigram_similar="coca cola") and if we still don't get a good result, we still can create a new brand.