Add custom wheel event handler and other props

[PabloLION]

Adds support for custom wheel event handling and other terminal functionalities in the XTerm component.

• Implements the customWheelEventHandler prop in the XTermProps interface with a docstring, allowing users to attach a custom wheel event handler to the terminal.
• Adds props for linkProvider, characterJoiner, deregisterCharacterJoiner, registerMarker, and registerDecoration in the XTermProps interface, each with appropriate docstrings. These props enable users to register custom handlers and providers for various terminal functionalities.
• Processes the customWheelEventHandler in the XTerm component constructor, attaching it to the terminal instance if provided.
• Includes placeholders and docstrings for handling linkProvider, characterJoiner, deregisterCharacterJoiner, registerMarker, and registerDecoration props, indicating an intention to implement these functionalities in the future.

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For more details, open the Copilot Workspace session.

[PabloLION]

Only the first commit was done by GitHub Copilot Workspace. Either it's not very clever or I don't know how to use it.