Create Contract State Migration Helper

[Mosas2000]

## Description

Add helper functions for migrating contract state between versions without breaking stored data.

## Requirements and context

- Versioned migrations

• Forward compatibility

• Validation checks

• Safe rollback path

• Event emission

• Documentation

  Suggested execution

  Fork the repo and create a branch

  git checkout -b feature/contract-state-migration-helper

  Implement changes

  • Add migration helper functions

• Validate old and new state shapes

• Expose migration entrypoints

• Add contract tests

• Document migration strategy

  Example commit message

  feat: create contract state migration helper

  Guidelines

  • Assignment required before starting
  • PR must include a closing reference to this issue
  • Include screenshots or examples where applicable
  • Timeframe: 72 hours