feat: Add normalizing of input values that are missing delimiters

[tr3ysmith]

If the user puts in 03012024, currently now nothing happens, but with this change, as long as its a single date config, it'll add in the separators like 03/01/2024 so the date is parsed correctly. It depends on the display format and I supported the most common display formats.

MMDDYYYY YYYYMMDD DDMMYYYY MMDDYY YYMMDD DDMMYY

And it doesn't care about the separator used in the display format.