Excel style editing sample issues.

[MayaKirova]

The editing-excel-style xplat sample does not quite work as expected in any of the generated samples (wc, react, blazor). For reference, it should work as in the angular sample: https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/cell-editing#grid-excel-style-editing

WC: https://staging.infragistics.com/products/ignite-ui-web-components/web-components/components/grids/grid/cell-editing#grid-excel-style-editing
React: https://staging.infragistics.com/products/ignite-ui-react/react/components/grids/grid/cell-editing#grid-excel-style-editing
Blazor: https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/cell-editing#grid-excel-style-editing

Issues:

• You cannot directly start typing on the active cell to change the value.
• Enter/Shift+Enter changes the active cell correctly, however it also causing it to enter/exit edit mode, which is incorrect.

[MayaKirova]

@skrustev The issue with the typing seems to be a problem in the wc grid, so I logged it here: IgniteUI/igniteui-angular#14028

[MayaKirova]

After looking into it, it seems that the gridKeydown is not an appropriate event for this since it by design ignores any key that is not supported action for the navigation service (more info here)
So probably the sample should be reworked to use keydown or if that's not supported in the editor - be made into custom samples per platform.