[DataGrid] Remove GridEvents enum

[flaviendelangle]

Closes #4684

Changelog

Breaking change

The GridEvents enum is now a TypeScript type.

-apiRef.current.subscribeEvent(GridEvents.rowClick', handleRowClick)
+apiRef.current.subscribeEvent('rowClick', handleRowClick)

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	508.4	1,061.8	508.4	748.46	234.883
Sort 100k rows	ms	555.3	1,203.2	555.3	898.76	234.906
Select 100k rows	ms	213.7	321.4	235.6	254.94	38.382
Deselect 100k rows	ms	119.9	309.5	199	215.62	78.158

Generated by 🚫 dangerJS against 7cae5d9

[DanailH]

I've no objections to this change. If we are doing this then it probably makes sense to also remove, as part of a separate PR (I can take care of it), the GridFeatureModeConstant and just keep the type.

Also, we can point this to next on Friday and merge it.

[flaviendelangle]

I've no objections to this change. If we are doing this then it probably makes sense to also remove, as part of a separate PR (I can take care of it), the GridFeatureModeConstant and just keep the type.

Indeed this fake enum make no sense to me 😆

[flaviendelangle]

@DanailH if you can approve this one