feat: ✨ Subclass datetime.datetime

[ToothyDev]

Summary

This PR aims to subclass the builtin datetime.datetime class and move any time-related utils methods there.
See issue #149

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[pycord-app]

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This pull request can be checked-out with:

git fetch origin pull/224/head:pr-224
git checkout pr-224

This pull request can be installed with:

pip install git+https://github.com/Pycord-Development/pycord-next@refs/pull/224/head

[read-the-docs-community]

Documentation build overview

📚 pycord-next | 🛠️ Build #30869020 | 📁 Comparing 8ac36da against latest (0d92d17)

🔍 Preview build

Show files changed (39 files in total): 📝 38 modified | ➕ 1 added | ➖ 0 deleted

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genindex.html	📝 modified
migrating_to_v2.html	📝 modified
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api/audit_logs.html	📝 modified
api/data_classes.html	📝 modified
api/events.html	📝 modified
api/models.html	📝 modified
api/utils.html	📝 modified
api/webhooks.html	📝 modified
_modules/discord/activity.html	📝 modified
_modules/discord/audit_logs.html	📝 modified
_modules/discord/datetime.html	➕ added
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modules/discord/webhook/async.html	📝 modified

[NeloBlivion]

Mostly just catching strays, make sure to check everything. All public-facing attributes and methods should return DiscordTime, but parameters entered on the user's end can remain as datetime.

[Paillat-dev]

Imma take a look tomorrow I think I'm rly tired rn sorry for the delay but seems good so far