message: add new enums for datasource types
diff: @@ -174,8 +174,16 @@ class GenericDataType(IntEnum):
  # ROW = 7
  +class DatasourceType(Enum):
  + SQLATABLE = "sqlatable"
  + TABLE = "table"
  + DATASET = "dataset"
  + QUERY = "query"
  + SAVEDQUERY = "saved_query"
  +
  +
  class DatasourceDict(TypedDict):
  - type: str
  + type: str # todo(hugh): update this to be DatasourceType
  id: int
  