suggestion: move `std/fmt/colors` to `std/cli/styles`

[iuioiua]

I suggest moving/renaming std/fmt/colors to std/cli/styles for the following reasons:

1. The module contains functionality for more than just colors. I.e. italic() and bold(). Hence, the rename to styles.
2. The module's functionality is only concerned with console output. Hence, the move to std/cli. This new name would make far more sense than it currently does and be much more accurate.

This is a continuation of the conversation happening in #4326.

[andrewthauer]

What about std/cli/ansi instead?

[iuioiua]

What about std/cli/ansi instead?

We think std/cli/styles would be better. See https://github.com/denoland/deno_std/issues/4326#issuecomment-2092015391