api/codeforces: Expose user submissions data (with DB persistence)

[KShivendu]

You may refer to what I've done for displaying rating_update data.

The steps that you need to take are :

• models.py create new model CodeforcesUserSubmission which should be similar to CodeforcesUserRatingUpdate
• serializers.py: Create a new serializer Cf_Submission_Serializer which should be similar to Cf_RatingUpdate_Serializer
• serializer.py: add submissions variable in Cf_User_Serializer (similar to rating_updates)
• views.py: Use code from self.submissions at line 162 and store the relevant data in CodeforcesUserSubmission model

You might have to modify the submissions() function to adjust for the new changes.

[akshaywairagade2]

yes i will look into it