feat: improve date parsing

[ThibaudDauce]

• Replace fix: cast dd/mm/yyyy dates day-first (was silently swapping day and month) #268

• add date_format to profile to have a faster cast in hydra

• by finding a unique date format for the column it prevent having US dates (month first) vs FR dates (day first) mixed

• date_fr is removed, date reads the same values and gives them a real date python_type. Stored analyses naming it still validate, nothing to regenerate.

• hydra stats (require perf: cast dates with the format inferred by csv-detective hydra#470):

Fichier	inspection			csv to db			total
	main	branche	Δ	main	branche	Δ	main	branche	Δ
ValeursFoncieres-2024.txt	44,2	44,3	+0 %	50,1	31,6	−37 %	94,3	75,9	−20 %
ValeursFoncieres-2025-S1.txt	16,4	16,5	+0 %	20,2	12,7	−37 %	36,7	29,2	−20 %
MN_07 (sans date)	30,5	28,9	−5 %	9,9	10,1	+2 %	40,3	39,0	−3 %
joconde.csv	106,8	104,2	−2 %	22,6	18,5	−18 %	129,4	122,8	−5 %
irve.csv	7,9	6,7	−15 %	12,6	5,7	−55 %	20,6	12,4	−40 %

Some analyses will be invalidated and replayed after the merge. Values dateutil used to read as dates and that we don't detect anymore, on the files I have locally:

Fichier	Colonne	Valeurs	Exemple
joconde.csv	Mesures	693	D. 2.9 ; E. 0.6
joconde.csv	Numero_inventaire	270	M 1089
joconde.csv	Millesime_de_creation	76	134,138
irve.csv	consolidated_latitude	1700	48.825613
irve.csv	telephone_operateur	12	0680428426
MN_07	AAAAMMJJHHMN	2000	202501010000

Everything but the last one is noise dateutil was finding in phone numbers, latitudes and museum inventory numbers. AAAAMMJJHHMN is a real one: it's now datetime_naive where it was date, so the column type changes in the db (it holds hours and minutes that the date type was dropping).

[estellebertrand]

A necessary change! The logic looks good, but I need to take more time to review all changes more carefully :)

[bolinocroustibat]

LGTM, with two remarks

[estellebertrand]

LGTM - still reading it all to ensure no regression

[estellebertrand]

Here, unsure why do we drop this format ? Because not an known separate format and this can be included in date.py just as a type of date format like any other ?
[the comment was for the deleted date_fr file, not appearing on the right one here + this has been managed since by commit 48219e8]