Change task comment api

[RiddhiAthreya]

Description

• The API endpoint /mentorship_relation/{relation_id}/task/{task_id}/comments/ response has been changed to include the details of the author of the corresponding comment
• Swagger UI docs has been changed to reflect the same

The response has been changed to :

Fixes #1110 #685

Type of Change:

• Code

Code/Quality Assurance Only

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update (software upgrade on readme file)
• Enhancement

How Has This Been Tested?

Has been tested in local environment by accessing the endpoint. An example :

Checklist:

• [ ] My PR follows the style guidelines of this project
• [ ] I have performed a self-review of my own code or materials

Code/Quality Assurance Only

• [ ] Unit test cases have been updated

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[RiddhiAthreya]

@epicadk I've made a PR , please let me know if any changes are required

[epicadk]

Also link #685

[epicadk]

If in the future we want to have a mentor groups then I think this would not be easily extendable to that.

[RiddhiAthreya]

@epicadk Oh I see. Then should I include the corresponding user's details in each comment object?

[RiddhiAthreya]

@epicadk I've made the changes in the latest commit. Let me know if any changes are required