Add Cell Selection Support

[w-ahmad]

Problem Statement

Currently, the WinUI.TableView control does not support the selection of individual cells. This limitation restricts the ability to perform cell-specific operations, which are common in data grid scenarios.

Proposal

Implement cell selection functionality to enhance the control's interactivity and usability. This will allow users to select a single cell or multiple cells using keyboard shortcuts or mouse actions. It would bring WinUI.TableView in line with other DataGrid controls.

Key Features

• Individual cell selection
• Multi-cell selection
• Range selection
• Extended range selection
• Copy and Export actions on selected cells