[pickers] Clean popper position on new pickers

[flaviendelangle]

Part of #7440

This one changes the behavior compared to v5 so it's worth discussing

• Set the position of single input pickers (non range) to bottom-start
• Keep the position of multi input pickers (range) to center but add fullWidth prop to the TextField to make sure there is never space at the right of the last input

https://deploy-preview-7445--material-ui-x.netlify.app/x/react-date-pickers/date-picker/#basic-usage

[mui-bot]

	Messages
📖	Netlify deploy preview: https://deploy-preview-7445--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	600	912.2	729.4	733.28	110.929
Sort 100k rows	ms	588	1,106.3	788.5	845.3	167.789
Select 100k rows	ms	205.9	302	280	261.48	39.19
Deselect 100k rows	ms	141.6	294.3	237.6	235.16	52.828

Generated by 🚫 dangerJS against 9d51e33

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[oliviertassinari]

It feels much better on my end in this demo https://deploy-preview-7445--material-ui-x.netlify.app/x/react-date-pickers/date-picker/#basic-usage 👌

Regarding the transition, something feels wrong, it doesn't feel great. Maybe no transitions would feel better or faster on or with an origin a bit more on the left side. Maybe it's only point 12 of #7440.

[flaviendelangle]

Regarding the transition, something feels wrong, it doesn't feel great. Maybe no transitions would feel better or faster on or with an origin a bit more on the left side. Maybe it's only point 12 of #7440.

We can experiment with different transitions in another PR.
Spectrum has no transition for example.

[LukasTy]

Great job!
Very nice fine-tuning improvements. 👌