Search : accents are not ignored when setting caseSensitive: true

I want to ignore accents when i type for example etudes i want to display études also

## Expected Behavior
when i search for a words like etudes i want to have in result études also
## Current Behavior
when i search for a words like etudes nothing is displayed
```
const options = {
responsive: "standard",
selectableRows: "none",
caseSensitive: true,
};

```

| Tech | Version |
|--------------|---------|
| Material-UI | 4.11.4 |
| MUI-datatables | 3.7.7 |
| React | 17.0.2 |
| Microsoft Edge | 93.0.961.47 |

Start by tracing the table's search and filtering logic for the caseSensitive option, then reproduce the issue with “etudes” and “études” using the example configuration. Done means accent-insensitive matching works while the requested case-sensitivity behavior remains intact.

Written by the indexing model from the issue text.