feat: Generate tests file template for feature_brick

**Description**

As a developer, I would like my tests file to be generated and formatted when using the feature_brick brick

**Requirements**

- [x] Add Widget Tests template
- [x] Add Bloc Tests template
- [x] Add Cubit Tests template
- [ ] Add Provider Tests template
- [ ] Add Riverpod Tests template

**Additional Context**

N/A
