Adding Base ViewModel Class

[mdwigley]

Description

Adds a new abstract ViewModelBase class that provides core ViewModel functionality, including dependency injection, data binding, and a virtual event handler. This class allows UI developers to create and bind controls efficiently while maintaining consistent patterns across the project.

Related Issue

• Resolves Base ViewModel Class #63

Motivation and Context

Standardizes ViewModel creation and reduces repetitive boilerplate code for dependency injection and binding in UI components. Provides a foundation for future ViewModel development with consistent access to services and event handling.

How Has This Been Tested?

• Verified that the project compiles successfully

Types of changes

• 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)
• Asset change (adds or updates icons, templates, or other assets)
• Documentation change (adds or updates documentation)
• Plugin change (adds or updates a plugin)

Checklist:

• I have read the CONTRIBUTING document.
• My change requires a change to the core logic.
  • I have linked the project issue above.
• My change requires a change to the assets.
  • I have linked the asset issue above.
• My change requires a change to the documentation.
  • I have linked the documentation issue above.
• My change requires a change to a plugin.
  • I have linked the plugin issue above.