LP1983628: Add editor for item notes

LP1983628: Add editor for item notes

Test plan:
1. Open your favorite bib record in the staff catalog
2. On the item table tab, find a barcode and click "Edit"
3. Press the Item Notes button.
4. Add a note with a title and value.
5. Press Apply Changes
6. Press Apply All and Save
7. Press the Item Notes button again.
8. Without this commit, you will not have a way to edit
these notes.  With this commit, you will have an edit
button.
9. Confirm that you can Back out of the editor without
making changes
10. Confirm that you can make changes and they persist.

This commit also adds a test to confirm that this fm-editor
won't inadvertently fetch every single row in asset.copy
(as a linked field).

Signed-off-by: Jane Sandberg <js7389@princeton.edu>