Refactor post views and test

[fflorent-01]

Make sure the view functions in backend/api/views/post_views.py are converted to DRF. And integrated to what's been done so far in auth_views.py.

• Caching is integrated for all post requests

• Media handling is integrated for all post requests

• Post related models are handled for all post requests

• create_post is integrated => POST a single post

  • Hashtag get created if needed
  • File upload is working
  • Add following notification based on preferences

• edit_post is integrated => PUT a single post

  • Hashtag get created/deleted if needed
  • File upload is working
  • Add following notification based on preferences

• delete_post is integrated => DELETE a single post

  • Related orphan files get deleted
  • Related orphan hashtag get deleted
  • Related following notification gets deleted

• get_user_posts is integrated => GET all post from a specified user

  • Must support limit argument

• get_single_post is integrated => GET a single post from post_id

• get_multiple_posts is integrated => GET posts from specified list of post_id

• get_global_newsfeed => GET posts from specified post_type

  • Handles limit

• get_newsfeed => GET posts from following, hashtags, limit

• add_post_bookmark => POST a bookmark relative to a specified post_id

• delete_post_bookmark => DELETE a bookmark relative to a specified post_id

• get_bookmarked_posts => GET list of all bookmarked post