Feature: Implement CRUD Endpoints for Feedback in Feedback Service

[f-s-h]

Implement the following endpoints:

Method	Endpoint	Success Code	Error Codes	Description
POST	/feedback	201 Created	400	Creates a new feedback.
GET	/feedback	200 OK	400	Retrieves a list of all feedback.
GET	/feedback/{id}	200 OK	400, 404	Retrieves a specific feedback by its ID.
PUT	/feedback/{id}	204 No Content	400, 404	Updates an existing feedback by its ID.
DELETE	/feedback/{id}	204 No Content	400, 404	Deletes a specific feedback by its ID.

• Protocol: JSON over HTTP.
• Headers: All requests sending data and all responses must include Content-Type: application/json.
• Error Payloads: 400 Bad Request and 404 Not Found responses must return a plain JSON object containing error details (e.g., {"error": "Feedback not found"}).