Suggestion: implementing auto-mocking capabilities

Hi,

The testing package in golevelup is great, the easy functionality of createMock makes it easy to mock things without any effort; @jmcdo29 - saw your issue at nest repo (https://github.com/nestjs/nest/pull/6277 - feat(testing): add auto-mocking capabilities) and thought maybe I can implement it, so I did.

My questions are (1) Do you still want this feature? (2) Is this the right repo to create a PR in?

Here is a code snippet example:

describe('Unit Test', () => {
  let someService: DeepMocked<SomeService>;

  beforeAll(() => {
    someService = Unit.createTestingService(SomeService)
      .mock(ClientService)
      .with({
        foo: () => Promise.resolve({ token: '' }),
      })
      .mock(PayService)
      .with({
        bar: () => 'dogs are awesome',
      } as any)
      .compile();
  });

  describe('Test Something', () => {
    test('then do something', () => {
      expect(1).toBe(1);
    });
  });
});

Where all the rest of the dependencies of the class SomeService are auto-mocked, everything is using createMock() of course

[WonderPanda]

That sounds awesome, thanks @omermorad!

[underfisk]

The auto mock will be available when #342 is released