Feat/migration module

[marrouchi]

Motivation

This PR introduces the new migration module to Hexabot, providing a robust and streamlined approach to manage database migrations. The module simplifies schema updates by allowing developers to create, execute, and roll back migrations while ensuring synchronization with the database state.

Key Features:
• Automatic generation of timestamped migration files in kebab-case.
• Tracks migration execution status in a MongoDB migrations collection.
• CLI commands for creating, running, and rolling back migrations (individual or all).
• Built-in rollback logic for reliable undoing of changes.
• Auto-apply migrations in development environments when config.mongo.autoMigrate is enabled.

Check the module README for more.

Type of change:

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added unit tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes