As a developer I want to fetch the data of a property, so I can use elements I need in my application
GET /entities/properties/{property_id}
Can be seen as a counterpart of GET /entities/items/{item_id}
The structure of data in response will be similar to item data structure with additional top-level `data-type` field carrying the data on the property's data type. There will be no `sitelinks` field and the Action API's `claims` field will be renamed to `statements`.
Note:
* authentication and authorization - same treatment as existing for GET item data endpoint.
* sitelinks do not exist on properties
* redirects do not exist for properties
To not include in this story (will be done later on)
* handling conditional HTTP headers
* `_fields` parameter to define what property data elements to include in the API response