Template generation

[tuturu-tech]

This PR adds the ability to automatically generate a fuzzing harness for a list of target contracts.

Fuzzing harness generation enables:

• Automatic generation of a fuzzing harness for a list of contracts. Includes inheritance, deployment, and wrapper functions with random Actor selection.
• Automatic generation of Actor contracts used as proxies for user actions. The Actor contracts contain wrapper functions to interact with the target contracts. The functions can be filtered so that only functions that have a certain modifier, are payable, or make a specific external call are included. This makes it easier to generate role based actors.
• Automatic generation of Attack contracts from a list of premade attacks. The same function filtering as above can be applied.

Refactoring

• Directory structure updated to make it easier to add new commands
• Parser refactored
• Foundry unit test generation moved to generate command
• Move file operations to a utility function
• HarnessGenerator and string templates refactored to reduce code duplication

Features

• init command added to initialize a configuration file
• template command added to generate a fuzzing harness. It includes the --name, --contracts, --output-dir, and --config flags. Added new string templates, classes, data classes.
• Add --config flag to template and generate commands so that a configuration file can be used

Tests

• Add tests for template command function filtering

Documentation

• Updated README.md to reflect the changes