chore: Use 4 columns for tab indents

[tofumatt]

In the interest of receiving less shame images and more consistency in our newlines for comments/bode, I propose we set a consistent column width for tabs in our code.

I've been running tabs in Gutenberg and other WordPress projects, but I kept my tab column width at 2 spaces because that's what other JS projects tend to use and I'm used to it. It seems 4-column-width, hard tabs are the WordPress norm, so we should have people's editors respect that.

[gziolo]

I'm always happy to land all the tools that automate everthing 👍

[gziolo]

By the way, we probably should integrate https://github.com/Automattic/wp-prettier into our workflow - it's prettier's fork which respects extensive spacing enforced by WordPress coding styles. Related issue in our repository #2819. Related issue in prettiers's repository: prettier/prettier#1303.

[ntwb]

This isn't required, and I'm closing this PR. If you want to have 2, 4, or even 8 columns as your view in your IDE/Editor then go for it. The only WordPress Coding Standards requirement is that the code indentation uses tabs and not spaces.

The following are all valid uses of indentation, though the shame milage may vary when sharing screenshots with others 😏

Edit: p.s. I think you'll find @aduth shaming was in relation to the comment formatting and not indentation 😂