Separate `pca.utils.errors` into standalone repo

[lhaze]

Milestone: 0.1 — Dependency Injection

If Dependency Injection subpackage is to be separated from the main repo, the pca.utils.errors should be treated the same, as it is a dependency of pca.utils.dependency_injection.

The repo & the codebase is already prepared here: https://github.com/pcah/pca-errors