Design an interface for the REST network requests

Tasks
Create an abstract class in the `network` module's rest folder, which holds the interface of the network client.
Add methods `get`, `post`, `put`, `delete` & `multipart`. Also, create methods to add and delete `interceptors`.
You can choose the name of the class. Put the class inside a folder named `client`.
Full path: `network/lib/rest/client/network_client.dart`