Eslint

[severo]

• rewrite the eslint configuration for clarity
• use @stylistic/eslint-plugin instead of deprecated eslint rules for styling
• use eslint-plugin-import to ensure the imports consistently use an extension (nit)
• use eslint-plugin-simple-import-sort to ensure the types are imported in a import type {... statement
• more default rules are used now. We could revert some if needed, but they all increase clarity, and handle the type definitions better.
• reformat all the code

[severo]

cc @platypii for visibility. Tell me if you're allergic to some style change.

[platypii]

Overall I like it, some nits

[severo]

thanks for the review and comments; here is the fix: #357