refactor(executor): Improve documentation and code organization in dependencies module

[GarmashAlex]

Refactor and Improve Documentation in Executor Dependencies Module

Motivation

The dependencies.rs module in the executor crate contained complex logic with minimal documentation and some maintainability issues:

• Large monolithic functions were difficult to understand and maintain
• Variable names were not descriptive enough
• Documentation was insufficient for understanding the purpose of operations
• Code organization could be improved for better readability

Solution

This PR improves the code quality and maintainability of the dependencies module by:

1. Adding comprehensive documentation to main functions:

   • Detailed explanation of emit_divrem_dependencies
   • Clear documentation for emit_cpu_dependencies

2. Improving variable naming for better clarity:

   • Renamed cryptic variables to be more descriptive (e.g., c_msb → divisor_msb)
   • Made boolean variable names more explicit (e.g., c_neg → divisor_is_negative)

3. Refactoring the large emit_cpu_dependencies function into focused helper functions:

   • emit_memory_dependencies
   • emit_branch_dependencies
   • emit_jump_dependencies
   • emit_auipc_dependencies

4. Adding clear section comments and improving code organization

These changes maintain the existing functionality while making the code more maintainable and easier to understand for future contributors.

Testing

The changes are purely refactoring and documentation improvements. All existing tests continue to pass without modification.

Checklist

• Code follows Rust style guidelines
• Documentation has been updated
• Existing functionality is preserved
• No new dependencies added
• All tests pass