Adding Text Input Control

[mdwigley]

Description

Introduces a TextInput control supporting keyboard input, text selection, caret rendering, clipboard operations (cut, copy, paste), and undo/redo functionality. Includes new ITextCaretProperties and TextCaretProperties for styling caret behavior. The control integrates with the layout and rendering framework, supporting intrinsic sizing and dynamic style application.

Related Issue

• Resolves Text Input Control #61

Motivation and Context

Provides a fully featured text input control for UI development, allowing developers to implement interactive text fields with robust editing behavior, consistent visual feedback, and integrated undo/redo functionality.

How Has This Been Tested?

• Verified the control 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.