feat: [AXIMST-10] Refactor Unit page view as DRF #398

Job	Run time
collect-and-verify (3.8, pinned)	2m 49s
gh-hosted-python-3.8,django-pinned,lms-1	11m 12s
gh-hosted-python-3.8,django-pinned,lms-2	11m 0s
gh-hosted-python-3.8,django-pinned,lms-3	17m 1s
gh-hosted-python-3.8,django-pinned,lms-4	22m 0s
gh-hosted-python-3.8,django-pinned,lms-5	10m 11s
gh-hosted-python-3.8,django-pinned,lms-6	17m 26s
gh-hosted-python-3.8,django-pinned,openedx-1-with-lms	14m 29s
gh-hosted-python-3.8,django-pinned,openedx-2-with-lms	16m 35s
gh-hosted-python-3.8,django-pinned,openedx-1-with-cms	8m 4s
gh-hosted-python-3.8,django-pinned,openedx-2-with-cms	5m 5s
gh-hosted-python-3.8,django-pinned,cms-1	3m 16s
gh-hosted-python-3.8,django-pinned,cms-2	16m 7s
gh-hosted-python-3.8,django-pinned,common-with-lms	10m 21s
gh-hosted-python-3.8,django-pinned,common-with-cms	4m 43s
gh-hosted-python-3.8,django-pinned,xmodule-with-lms	6m 6s
gh-hosted-python-3.8,django-pinned,xmodule-with-cms	5m 35s
	3h 2m 0s

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