Lint overhaul (pylint to ruff)

[eginhard]

Copied from coqui-ai#3004:

This PR looks a bit big, but it's pretty straightforward if you look at the commits in isolation.

Basically, it replaces pylint and isort with the ruff linter, and re-enables linting in CI (now that it's not screaming an awful lot – I hope @erogol has found some peace of mind (ref. 8c1d8df)). The pylint configuration was converted with ttps://github.com/akx/pylint-to-ruff.

* `pre-commit` is also updated, but currently running `pre-commit run --all-files` yields a ton of changes.

* Some ruff rules are _not_ enabled at this point at all because they're kind of noisy, but they could be enabled in future PRs one by one.

* This PR supersedes [Update pre-commit tools #2992](https://github.com/coqui-ai/TTS/pull/2992).

* I found [[Bug] compute_attention_masks.py doesn't work #3002](https://github.com/coqui-ai/TTS/issues/3002) while working on this, so hey, there's clearly a point to this.

Additionally removed isort and updated to latest version of ruff.

[eginhard]

Lint check fails here, but works locally. Let's see how it goes...