exam chronological ordering

[mostafam99]

modified sort_key function to adjust slightly for exam months. the values are small so they don't conflict with year ordering. i don't know if this is a good fix or not

[yutotakano]

Thanks for the PR! I like the 0.1/0.2/0.3/0.4 idea, but I'm not sure I like adding hardcoded values to these sort keys. I found an interesting function in the Python standard library that maybe we can use, could you look into that?

[yutotakano]

This is clever, but I'm not sure I like the limited extensibility here; what if we have a November exam for one course? We don't have one now, but I believe non-Honours courses (SCQF 8 & 9) can have exams whenever they want and aren't constrained by Honours rules.

I found some cool behaviour with strptime, maybe you can use that? I'm not 100% sure if you can pass datetime to sorted() (backend/categories/views.py line 146), but if you can, this seems like a cleaner solution!

>>> import datetime
>>> datetime.datetime.strptime("December 23", "%B %y")
datetime.datetime(2023, 12, 1, 0, 0)
>>> datetime.datetime.strptime("may 24", "%B %y")
datetime.datetime(2024, 5, 1, 0, 0)