Mark prettier as supporting range formatting

[bradymadden97]

Why

Right now we hack this in on the frontend. But ideally this would be defined by the nixmodule and flow through.

I'll need to make a proto change to pass this from goval --> web. This is assuming it's safe to add new members here prior to making the goval change.

Describe what prompted you to make this change, link relevant resources

What changed

Describe what changed to a level of detail that someone with no context with your PR could be able to review it

Test plan

Describe what you did to test this change to a level of detail that allows your reviewer to test it

Rollout

Describe any procedures or requirements needed to roll this out safely (or check the box below)

• This is fully backward and forward compatible