[Pages] Add due dates for pages

[mdspauld]

Problem statement:

Canvas pages cannot be scheduled with unique due dates by user.

Proposed solution:

We would like your engineers to consider adding a feature to schedule due dates for Canvas pages. We would like Canvas to have the capability to differentiate due dates by user, rather than just one universal date. Our institution serves thousands of students across different curriculum versions and we use a system of rolling enrollment, so students start courses at various points throughout each curriculum year.

User role(s):

admin,designer