CI/add spell checker

[IanWorley]

#1943

[brillout]

The reason I was mentioning using their npm package is because it would allow us to correct spelling mistakes by simply running an npm script.

That's what we're doing with formatting:

• pnpm run format:check => throws an error if formatting is incorrect, used by the CI
• pnpm run format => fixes formatting issues, used by the user

I wonder if we can reproduce the same workflow for spelling?

[IanWorley]

@brillout my bad I will use the npm package

[brillout]

@IanWorley 👍 Btw. how big is their npm package? It's fine if it's a bit heavy, but it shouldn't be too heavy.