[db-api] - Comment reply
[models] - Comment reply schema updated
[db-api] - Comment: fixed typo.
[db-api] - Add comment to api interface
[db-api] - Proposal: Add comment action to proposal
[proposal] - Routing: Added route for comment action
[comment] - Routing: Add comment reply request handler
[db-api] - Fixed typo.
[db-api] - Comment: Fixed typo
[App] - Added routes for Comment API Service