allow checking formatting with cache

[sd-st]

Description

I run csharpier check as part of my lint flow, which means I run it a lot. On one of my repositories it takes 200ms to run format and 8000ms to run check. This PR allows for check to use the cache (although it can be disabled, just like for format)

Related Issue

Checklist

• My code follows the project's code style
  • always var
  • follow existing naming conventions
  • always this.
  • no pointless comments
• I will not force push after a code review of my PR has started
• I have added tests that cover my changes

[sd-st]

I think there's probably nothing to test here; it doesn't look like there were tests for the previous behaviour (and no tests for the CLI arguments in general as far as I can tell)

[belav]

My worry with this change is that I had a commit to specifically disable the cache when running check, but I don't recall why I would have made that change and neglected to leave a comment explaining why.

81c36d7

It seems safer to have a new option for the check command --use-cache so that it can default to the current behavior.

[sd-st]

I do think it's a little unfortunate to have a different API surface between checking and formatting but I made that change