Add data attribution column to annotation projects

[Aaron Su]

To support data attribution per annotation project, this issue is to build the backend support of it. Please refer to this issue to see more context about it.

• The data_attributions field is going to on annotation_projects table
• Default is an empty jsonb array '{}'::jsonb:
  • Why jsonb array? Because there could be more than one layer per project (default and overlays), and each will have a display name and an optional hyperlink for the display name
  • Why default to empty jsonb array? An empty jsonb array is better than an Option[T] in this case
• This field should look like below:

select '[{"name":"asdf", "link":"https://path/to/thing"}, {"name":"asdf2", "link":"https://path/to/thing2"}]'::json;
                                                                         json                   
------------------------------------------------------------------------------------------------
[{"name":"asdf", "link":"https://path/to/thing"}, {"name":"asdf2", "link":"https://path/to/thing2"}]
(1 row)

• Each element should be decoded to something like the following:

case class DataAttribution(
    name: String,
    link: Option[URI]
)

• Update annotation project CRUD endpoints to handle this new field properly