Switch to hard tabs for indentation

[Cherry]

As per: cloudflare/workers-sdk#1298

wrangler2, and all wrangler templates follow this paradigm for better accessibility by default. It would be great to get a similar .prettierrc and .editorconfig in this repo. I'm happy to PR this if welcome.

.editorconfig:

# https://editorconfig.org
root = true

[*]
end_of_line = lf
indent_style = tab
tab_width = 2

.prettierrc:

{
	"printWidth": 80,
	"singleQuote": false,
	"semi": true,
	"useTabs": true
}