Feat(func): enable type modifer in user defined function

[SIGMazer]

Description

This pull request introduces changes to support type modifiers for function parameters in the ast.c and ast.h files. The changes include updating the Parameter structure and modifying relevant functions to handle the new TypeModifiers field.

Changes to support type modifiers:

• ast.c: Updated the create_parameter function to include a TypeModifiers mods parameter and modified the enter_function_scope function to use the modifiers field from the Parameter structure instead of the get_current_modifiers function. [1] [2] [3]

• ast.h: Added a TypeModifiers modifiers field to the Parameter structure and updated the create_parameter function signature to include the TypeModifiers mods parameter. [1] [2]

Changes to function call handling:

• lang.y: Updated the param_list grammar rule to include optional modifiers and pass them to the create_parameter function.

Test case and expected results updates:

• test_cases/func-modifier.brainrot: Added a new test case to verify the handling of type modifiers in function parameters.

• tests/expected_results.json: Updated the expected results to include the output for the new test case, specifically handling an error for modifying a constant variable.

Related Issue

fixes: #97

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement
• Refactor

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have documented my changes in the code or documentation
• I have added tests that prove my changes work (if applicable)
• I have run the unit tests locally
• I have run the valgrind memory tests locally
• All new and existing tests pass

[leo-aa88]

niiiiice!