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This section details on the original issue you should resolve

<issue_title>[Feature]: Add OnFocusChanged() to Select</issue_title>
<issue_description>### Feature Description

As suggested in an earlier issue, add an OnFocusChanged() event handler to the Select component that is invoked when the highlighted option is changed.

Problem Statement

Problem 1:
The Select component does not have a way to page/scroll options and when the option list is too large it can overfill a console window.

Problem 2:
The Select component does not have an event handler invoked when the user changes the highlighted option via up/down navigation, which might otherwise provide a way to implement a scrollable window over a large options list.

Proposed Solution

OnFocusChanged() is added to the Select component.

Alternatives Considered

OnHighlightedValueChanged() could be a different name for the same event handler functionality proposed here.

Additional Context

No response

Contribution

• I'd be willing to contribute this feature</issue_description>

Comments on the Issue (you are @copilot in this section)

@LittleLittleCloud For problem 1, maybe look at scrollable example, it should be a perfectly fit for select with super long list.

For problem 2, Copilot go add a new parameter called FocusedValue so user can bind it from parent components.</comment_new>