Move django rest swagger to drf-yasg

[NeOneSoft]

This PR was created in order to remove django-rest-swagger package and use drf-yasg.

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[natabene]

@NeOneSoft Thanks so much for this PR, is this for edx/upgrades#17 ?

[NeOneSoft]

Hi @natabene yes it is ,thank you so much!!!

[NeOneSoft]

This PR was close on behalf of #1393 in order to fix conflicting files

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