fixed CheckBox & ToggleSwitch column IsReadOnly state issues

[w-ahmad]

fixes #36

• Fixed the issue where IsReadOnly state was not correctly applied to TableViewCheckBoxColumn and TableViewToggleSwitchColumn.
• Fixed CheckBox & ToggleSwitch Column's focus states.
• To prevent the unnecessary generation of CheckBox and ToggleSwitch controls during editing, introduced a UseSingleElement property in TableViewColumn. This is because both columns utilize the same elements for displaying and editing values. The property is set to 'false' by default, if set to true, TableViewColumn.GenerateEditingElement() method won't be called.
• Improved and fixed cell navigation issues specifically due to new implementations inTableViewCheckBoxColumn and TableViewToggleSwitchColumn.