Remove add annotations workaround in IIIF response

[adamjarling]

What does this do?

In a IIIF API response:

• Updates iiif-builder package to latest version, which includes support for applying annotations property onto a canvas.
• Removes our manual workaround of applying annotations to a canvas

How to test

• In the dev environment, identify (or create) a Work of "Video" type in your Meadow app which contains multiple Filesets.
• In Meadow, under a Work's Structure tab, click "Edit Structure (VTT)" button and add some valid VTT code.
• Inspect this Work directly in the DC API at http://localhost:3000/works/WORK_ID_HERE?as=iiif, and verify that the Fileset (canvas) with the above VTT has annotations` filled out.

[mbklein]

👍🏻 Looks good!