mui/mui-x v6.0.0-alpha.12 on GitHub

We'd like to offer a big thanks to the 6 contributors who made this release possible. Here are some highlights ✨:

🚀 The apiRef prop is now available in the @mui/x-data-grid package:
```
const apiRef = useGridApiRef();

return (
  <DataGrid apiRef={apiRef} {...other} />
)
```
See the documentation for more information.
🎁 The DataGridPremium now supports cell selection:
```
<DataGridPremium unstable_cellSelection />
```
See the documentation for more information
🌍 Support the Right To Left orientation on the fields components
📚 Documentation improvements
🐞 Bugfixes

The showCellRightBorder was renamed to showCellVerticalBorder
The showColumnRightBorder was renamed to showColumnVerticalBorder
The .MuiDataGrid-withBorder CSS class was renamed to .MuiDataGrid-withBorderColor and it only sets border-color CSS property now.
The following undocumented properties from apiRef were removed: footerRef, headerRef, columnHeadersElementRef, columnHeadersContainerElementRef
The GridHeaderPlaceholder component was removed.
The MAX_PAGE_SIZE constant was removed.
The useGridScrollFn hook was removed.

[DataGrid] Display sort column menu items as per sortingOrder prop (#7180) @MBilalShafi
[DataGrid] Support apiRef in Community package (#6773) @cherniavskii
[DataGridPremium] Add support for cell selection (#6567) @m4theushw
[DataGridPremium] Use separate cache for aggregation columns pre-processor (#7142) @m4theushw
[DataGridPro] Fix missing border in right-pinned columns (#4197) @cherniavskii
[DataGridPro] Fix wrong border color on skeleton cells (#7202) @cherniavskii

[fields] Fix bug introduced by RTL in single input range fields (#7189) @alexfauquette
[fields] Support RTL out of the box (#6715) @alexfauquette
[pickers] Clean autoFocus behavior on fields and new pickers (#7153) @flaviendelangle
[pickers] Fix label on the new range pickers (#7210) @flaviendelangle
[pickers] Fix wrong component name on StaticNextDateTime (#7187) @flaviendelangle

[docs] Add docs section about field placeholders' localization (#7139) @flaviendelangle
[docs] Create a DemoGrid component to unify demos with several components (#7057) @flaviendelangle
[docs] Document aggregation selectors (#7148) @cherniavskii
[docs] Fix 301 links to demo pages in API pages (#7197) @oliviertassinari
[docs] Fix errors and warning in demos (#7209) @LukasTy
[docs] Use DemoContainer and DemoItem on every picker demo (#7149) @flaviendelangle