feat: [AXIMST-148] API for certificate drf #415

Job	Run time
collect-and-verify (3.8, pinned)	2m 46s
gh-hosted-python-3.8,django-pinned,lms-1	11m 5s
gh-hosted-python-3.8,django-pinned,lms-2	10m 20s
gh-hosted-python-3.8,django-pinned,lms-3	17m 22s
gh-hosted-python-3.8,django-pinned,lms-4	22m 4s
gh-hosted-python-3.8,django-pinned,lms-5	10m 4s
gh-hosted-python-3.8,django-pinned,lms-6	17m 6s
gh-hosted-python-3.8,django-pinned,openedx-1-with-lms	13m 48s
gh-hosted-python-3.8,django-pinned,openedx-2-with-lms	16m 5s
gh-hosted-python-3.8,django-pinned,openedx-1-with-cms	7m 46s
gh-hosted-python-3.8,django-pinned,openedx-2-with-cms	5m 3s
gh-hosted-python-3.8,django-pinned,cms-1	3m 13s
gh-hosted-python-3.8,django-pinned,cms-2	16m 42s
gh-hosted-python-3.8,django-pinned,common-with-lms	9m 58s
gh-hosted-python-3.8,django-pinned,common-with-cms	4m 23s
gh-hosted-python-3.8,django-pinned,xmodule-with-lms	5m 37s
gh-hosted-python-3.8,django-pinned,xmodule-with-cms	5m 31s
	2h 58m 53s

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