ESLint plugin for keeping the recommended pseudo selector order

## Motivation

Simple pseudos [have a sorting order](https://github.com/kripod/otion/blob/fafda618525945f84abef5aba3a2528821676f3e/packages/otion/src/pseudos.ts) which will be recommended on the long term, even after #1 gets resolved. This should serve as a guarantee for atomic efficiency, generating the least amount of CSS rules possible.

## Details

The recommended configuration should emit an error until [customizable rule sorting](https://github.com/kripod/otion/issues/1#issuecomment-629990765) is implemented. After that, a warning should suffice.

Start by reviewing the pseudo-selector order in packages/otion/src/pseudos.ts and the linked discussion for customizable rule sorting in issue #1. Define the ESLint plugin's recommended configuration around that order, including when violations should be errors versus warnings; the issue is complete when the plugin enforces the recommended order as described.

Written by the indexing model from the issue text.