HTMLFormatter doesn't format ColocatedHook or ColocatedJS

[RodolfoSilva]

Environment

• Elixir version (elixir -v): 1.17.2
• Phoenix version (mix deps): 1.8.1
• Phoenix LiveView version (mix deps): 1.1.12
• Operating system: MacOS
• Browsers you attempted to reproduce this bug on (the more the merrier): All
• Does the problem persist after removing "assets/node_modules" and trying again? Yes/no: Yes

Actual behavior

Currently, when you add a ColocatedHook or a ColocatedJS inside a HEEx or EX file, the script is not formatted along with the HTML.

Expected behavior

When running mix format, the JS script should also be formatted, instead of only formatting the HTML.
Perhaps add support to format JS within the HTMLFormatter, or introduce a new module to handle it, such as a JSFormatter.

[SteffenDE]

We're not planning to work on this, but a PR that explores it is welcome. I think it makes sense to not do this in Elixir, but instead have an option to set a command and then use something like prettier to do the actual formatting of JS.