Respond with user info on post & search endpoint

[umitcan07]

🧱 Description

When we send a request to /posts or /search endpoint, we should grab the following info: isFollowing.

To be reviewed by: @umitcan07

📋 Acceptance Criteria

• [x] posts and search endpoint responds with the information of the post author relative to the user making the request.

[MucahitErdoganUnlu]

swagger ui's for them are available at /api/v2/swagger