Support parsing quarters of the year like 2025Q02

[amotl]

Hi, thank you so much for conceiving this excellent library, dateparser is awesome.

We are just having the need to parse date strings like 2025Q01, 2025Q02, and so forth. Maybe parsing them could be a valuable addition to dateparser, when possible?

[amotl]

It looks like the fiscalyear library could help here.

>>> import fiscalyear
>>>
>>> q = fiscalyear.FiscalQuarter(2025, 3)
>>>
>>> q.start
FiscalDateTime(2025, 4, 1, 0, 0)
>>>
>>> q.end
FiscalDateTime(2025, 6, 30, 23, 59, 59)