Support for TypeScript based configs, eg `postcss.config.ts`

[Mateusz Kadlubowski]

Modification Proposal

Add patterns to search for TypeScript extensions .ts in the config search places in this file:

postcss-loader/src/utils.js

Line 53 in b5c55fb

 searchPlaces: [ 

Expected Behavior / Situation

Since TailwindCSS as of version ^3.3.0 supports ESM and TypeScript config, the postcss.config.ts should be supported and loaded.

Actual Behavior / Situation

No support for TypeScript config.
Breaks: vercel/next.js#47774

Please paste the results of npx webpack info here, and mention other relevant information

I tried to run this command on the reproduction sandbox: https://stackblitz.com/edit/vercel-next-js-p7yaj5

But it fails with the error:

❯ npx webpack info
success Install finished in 3.453s

CLI for webpack must be installed.
  webpack-cli (https://github.com/webpack/webpack-cli)

We will use "npm" to install the CLI via "npm install -D webpack-cli".
Do you want to install 'webpack-cli' (yes/no): no
You need to install 'webpack-cli' to use webpack via CLI.
You can also install the CLI manually.