Enhance Tender Approval Filtering with Created Date Parameters

- Added new query parameters `created_from` and `created_to` to the tender approval endpoints for filtering by creation date using Unix timestamps.
- Updated the `GetByCompanyID` method in the repository and service layers to support the new filtering options.
- Modified the handler methods to parse and pass the new parameters, improving the flexibility of tender approval retrieval.
- Updated API documentation to reflect the new query parameters, ensuring clarity for API consumers.

cmd/web/docs/swagger.yaml

@@ -5075,6 +5075,14 @@ paths:
         in: query
         name: status
         type: string
+      - description: Filter by created date from (Unix timestamp)
+        in: query
+        name: created_from
+        type: integer
+      - description: Filter by created date to (Unix timestamp)
+        in: query
+        name: created_to
+        type: integer
       produces:
       - application/json
       responses: