Is there a module which creates a field where you can choose the field type of the key and also the value during content type creation?
You can use the Field Collection module to achieve that functionality:
Provides a field-collection field, to which any number of fields can be attached.
A field collection is internally represented as an entity, which is embedded in the host entity. Thus, if desired field collections may be viewed and edited separately too.
The idea is:
- Create a Field Collection.
- Add key/value fields to it with the field types of your choice.
- Add a Field Collection field to the content type you want these key/value fields on.
- Set the source of that Field Collection field to the new Field Collection you've just created.
- Repeat for whatever other content types you need to.