Add Typos to CI

[MaximeBICMTL]

Description

This PR adds Typos as a development tool for LORIS Python.

Typos is a language-agnostic tool to find typos in a codebase, including code files, documentation... It can be installed using pip (among others), and run locally, as an IDE extension, and/or in CI. It is really fast (built in Rust) and usually has a small number of false positives (it uses a dictionary of known typos, 3 false positives found in this PR).

Details

• This first commit does the following:
  • Add Typos as a Python development dependency (pip install .[dev])
  • Configure Typos in pyproject.toml
  • Add a dedicated Typos step in our GitHub Actions
  • Add a new typos_to_github.sh test file to display the typos found directly in the GitHub interface.
• The second commit fixes non-bug typos.
• The third commit fixes a bug typo ( 🙀 ).

The configuration uses the US English locale since it is the most international English variant and is arguably simpler.