refactor(modelSingleSelect): refactor modelSingleSelect to be more ergonomic

[Birkbjo]

Refactor ModelSingleSelect to be more ergonomic. The API of passing useOptions-hooks are not very ergonomic, and I'm pretty sure it violates the rule of hooks.

However, most importantly this will now preserve the Model. Previously we had to format and parse back and forth to the id. But I think it's very important that we have the ability to store complex objects in the form-store (as opposed to just the id) - because we have logic that need more information from other fields. All other forms than dataElements follow this idea.

This mostly follows the same composition as ModelTransfer:

• BaseModelSingleSelect translates a Model (id and displayName) to be used with our SearchableSingleSelect.
  • SingleSelect accept a string as a value, and returns a string. However we want to "preserve" the full model. This component handles that.
• ModelSingleSelect deals with fetching data. It takes a simple query and fetches an inifinite list with support for "search".
  • I've also added the ability to pass a PartialLoadedDisplayableModel. This makes it possible for this component to fetch the label if you just have access to "id" of the model. This is useful for our filters in the List (where we just have IDs in URL on first render) - and for eg. selected-models in the list.
    • This does add some complexity, and we could always handle this on a level above. However, I think it greatly simplifies usage of these components. The old ModelSingleSelect also had support for this.
• ModelSingleSelectField is used to compose the selector with a final-form connected field. We mostly use selectors in forms, and this greatly reduces boilerplate for such fields.

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