Decrease request usage

[Caylies]

Description

There are many scenarios in DexI where the same requests are being fired, which slows down DexI. Instead, requests, such as fetching a pyproject file for example, should be cached in certain scenarios.

[dormieriancitizen]

I made a similar suggestion in the suggestions thread but I should echo it here.

Alternative to caching: use actual git instead of relying on githubusercontent. Benefits include:

• Could use git hosts that aren't GitHub (for example iirc wascertified hosts their packages on codeberg)
• Would dramatically reduce requests (would only need to run one git fetch, and this is not nearly as heavily rate limited since this is the core offering of GitHub)
• Simplification of update logic: all of it can be replaced with an easy git pull
• If you want to lock a package to a specific version (say you aren't ready to update BD yet), DexI could just store a commit hash

[Caylies]

Resolved by #11