[FEATURE]: [SHORT DESCRIPTION]

[sudhansurana]

Feature Check list

• [x] Agree to the Code of Conduct
• [x] Read the README to ensure the feature is not already present
• [x] You read Creating Issues, Features and Pull Requests
• [x] Considered the value versus complexity for all users of the library as well as library maintenance
• [x] Considered if this can be a storybook or documentation example

Is your feature request related to a problem? Please describe

With selectableRows there is no role given to column header or the cell

Describe the solution you'd like

Please add role="columnheader" to the column header cell and role="cell" to the checkbox container in each row.

Describe alternatives you've considered

None

Additional context

Accessiblity tools are failing the datatable in selectableRows option.