[pickers] Ditch pickers skipLibCheck

[LukasTy]

Related to dmtrKovalenko/date-io#52

If we were able to remove skipLibCheck: "true", we would avoid most issues like #7779

Currently, our authored .d.ts files are ignored by tsc and thus, any issues in them can slip unnoticed by both human eye as well as CI steps.

It's not the most robust solution as package bumps might need changes, but IMHO it's worth the added type safety in our authored d.ts files. 🙈 🤞

• Fix @date-io adapters type declaration module names to be uniquely scoped (seems like it should originally be something like that)
• Rename date-fns-jalali duplicated typing type names to avoid tsc issues

[mui-bot]

	Messages
📖	Netlify deploy preview: https://deploy-preview-7808--material-ui-x.netlify.app/

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	689.6	1,297.9	689.6	938.24	231.399
Sort 100k rows	ms	821.1	1,337.8	1,337.8	1,142	202.737
Select 100k rows	ms	203.8	333.2	289.3	271.14	52.382
Deselect 100k rows	ms	222.5	357.3	242.8	271.08	53.61

Generated by 🚫 dangerJS against 034c288

[flaviendelangle]

Moving the adapters to our repo will allow us to remove those patches in the future.