WIP SE-2320 Adds django-cookies-sameseite middleware

Description

and settings to set SameSite=None for all secure cookies.

*Discussion*

https://discuss.openedx.org/t/lti-xblock-and-samesite/759/6

*Sandbox*

Building.

Assignee

George Babey

Reporter

Open Source Pull Request Bot

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Contributor Name

Jillian Vogel

Repo

edx/edx-platform

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