Add updated_at fields to more models

[jonsch318]

This would resolve #4672.

From a client perspective like kitshn updated_at filters are nice because they allow for better synchronization without much hassle since we can get only the newest updates after the last synchronization.

I started with Food, SupermarketCategory and Unit because they were already using the StandardFilterModelViewSet which allowed updated_at queries but the models where missing the property, which i added. I would be fine with change only but I thought it would be better if most mutable models would allow for updated_at queries and it would be better to do it in one swoop than multiple times later on requiring a migration.

Since many do not derive the StandardFilterModelViewSet i added a new smaller UpdatedAtFilterBackend. I needed to use the BaseFilterBackend with get_schema_operation_parameters so that the query documentation is correct.

I also added tests for the updated_at filter.

There are some models like Logs, Space, FoodProperty, Space, ConnectorConfig but I think these are fine and not really that change frequent.

I tried generating the vue3 openapi client but many many things changed especially .openapi-generator/FILES which some where removed for some reason idk. So I did not want to clutter up this PR. Just say that I should include it if thats wanted.

[vabene1111]

thank you, that makes sense for offline clients. I will review it and try to get it merged with one of the next releases. Sorry that things are a bit slow at the moment as I am extremly busy IRL and also have smilerzs big batch of PRs that I promised to look at before breaking them all with changes first.

[jonsch318]

no worries take your time.