Add dd.mm.yyyy to date inference / parsing

[JulianCologne]

Description

the dd.mm.yyyy is a very common date format which currently is not infered by polars.

https://en.wikipedia.org/wiki/List_of_date_formats_by_country

just seaching wiki for different separators I found

• dd/mm/yyyy: 36x ✅
• dd.mm.yyyy: 26x --> Missing currently 😞
• dd-mm-yyyy: 7x ✅

polars/crates/polars-time/src/chunkedarray/string/patterns.rs

Lines 4 to 7 in 95cbf34

	pub(super) static DATE_D_M_Y: &[&str] = &[
	"%d-%m-%Y", // 31-12-2021
	"%d/%m/%Y", // 31/12/2021
	];

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whoopsi just saw this is a duplicate of #14990

[alexander-beedie]

Yup; closing in favour of the earlier issue ;)