Add docs and CI to cvxpylayers 1.0 rewrite

[langestefan]

This modernizes the project to use pyproject.toml with default layout with dedicated src and tests folders.

I have also added several code quality checks using ty and ruff. These can be made available to the developer using pre-commit and are also added as checks in CI.

Note that much of the docs content is still missing, at this stage it is a skeleton.

The following tasks still need to be completed:

• ruff and ty checks do not pass
• links in documentation need to be changed to point to the correct addresses
• unit tests for JAX are not formatted yet
• most of the source code is missing awaiting the rewrite from Parth
• type checking and linting can be quite finicky. We will have to use ruff.toml files to exclude the checks we don't want to do (see https://docs.astral.sh/ruff/configuration/). I have already created two ruff.toml files, one for tests and one for examples.
• We will need to update the build script. We don't have to use uv for that, but it's probably the best option out there at the moment. The way I have setup pyproject.toml should make the main package lean.
• Automatically creating API documentation from docstrings