AL-2183 - Add MediaType support to Project

[paulnoirel]

This is the implementation of https://labelbox.atlassian.net/browse/AL-2183 to create, retrieve and update media types for projects.
To highlight that MediaType is generic and not specific to projects, the enumeration was relocated to its own file media_type.py.

Terminology

We use the terminology MediaType and media_type to match the GraphQL type and make it easier to use compared to allowedMediaType found in the Project table.

Implementation of the MediaType enumeration

The names in the MediaType enumeration use title case. This matches the convention of the existing QueueMode enumeration in the Project class. With that said, the enumeration also supports upper case names for compatibility with the GraphQL type.
To support the case when media_type is not set for the project, if MediaType is called for None then it returns MediaType.Unknown.

In order to match the UI, a few aliases were added compared to the GraphQL MediaType type:

Type GraphQL	Alias
PDF	Document
TMS_SIMPLE	Simple_Tile
TMS_GEO	Geospatial_Tile

Otherwise, the enumeration matches the GraphQL type (including Unsupported for future usage).

Case of MediaType.Unknown

Although the member MediaType.UNKOWN exists in GraphQL, it is not a supported value. Since using it would lead to a HTTP 500 (internal server error) error, this value is filtered for both client.create_project() and Project.update().

Side modification

The file labelbox/orm/db_object.py is slightly modified to support the case where data_type is not set (aka value is None).

[jtsodapop]

lgtm, minor nits

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB