[DataGrid] Export `GridColumnUnsortedIconProps` interface for custom slots

[michelengelen]

Since the interface for GridColumnUnsortedIconProps is not exported (reference link below) users will have to create the interface in their implementation itself. It's easy, but shouldn't be needed tbh.

https://github.com/mui/mui-x/blob/e723473706d1c81678249ca61921a9d959cea750/packages/grid/x-data-grid/src/material/icons/GridColumnUnsortedIcon.tsx#L6-L8

Originally posted by @michelengelen in https://github.com/mui/mui-x/issues/11320#issuecomment-1845818262

Diff to fix this:

diff --git a/packages/grid/x-data-grid/src/material/icons/GridColumnUnsortedIcon.tsx b/packages/grid/x-data-grid/src/material/icons/GridColumnUnsortedIcon.tsx
index 4fe7d0596..a014822fc 100644
--- a/packages/grid/x-data-grid/src/material/icons/GridColumnUnsortedIcon.tsx
+++ b/packages/grid/x-data-grid/src/material/icons/GridColumnUnsortedIcon.tsx
@@ -3,7 +3,7 @@ import * as React from 'react';
 import { useGridRootProps } from '../../hooks/utils/useGridRootProps';
 import { GridSortDirection } from '../../models/gridSortModel';

-interface GridColumnUnsortedIconProps extends SvgIconProps {
+export interface GridColumnUnsortedIconProps extends SvgIconProps {
   sortingOrder: GridSortDirection[];
 }

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[AshishDhama]

@michelengelen Could you please assign this one to me

[michelengelen]

@AshishDhama sure ... If you need help setting up the project feel free to reach out. Otherwise... Happy coding! 💪🏼