Feature: Model Brick Implementation for Bond-cli

[mohamedalwhaidi]

This pull request introduces a new model brick for our Bond CLI.

Features

• The new model brick provides an efficient way to generate model classes.
• It supports optional generation of JSON serialization methods using json_serializable.
• It supports optional generation of copyWith methods.

Changes

• Added a brick.yaml file that defines the model brick and its variables.
• Created a template for generating model classes.
• Added a README.md file with instructions on how to use the model brick.

Usage

• To create a new model, use the command mason make model --name <model_name>.
• To include JSON serialization, use the --j true option.
• To include a copyWith method, use the --c true option.

This is a step towards making our CLI tool more powerful and efficient, and helping developers save time when creating new features. Looking forward to your feedback!

[salahamassi]

LGTM

[salahamassi]

does flutter bond is the best place for the Mason and the generator code? I think we should think about extracting it into a separate package؟