Initial work to move indentation services down to codestyle layer (step 4/N)

[CyrusNajmabadi]

Followup to #60440

This continues that work by pushing ISmartTokenFormatter down to the codestyle layer.

I'm doing these PRs in multiple parts to make things simpler to review. Every time i try to tackle the general problem, it explodes into a ton of changes.

The reason for this change overall is that we have fixers taht need to know indentation information. For example, the 'convert to file-scoped-namespace (and reverse)' fixes have to know indentation information so it can make the right fixes. Not having indentation info be available at thsi level means that the fixes are constrained to the VS host.

[mavasani]

LGTM, mostly nits.

Every time i try to tackle the general problem, it explodes into a ton of changes.

I can feel your pain, I ran into the same things when trying to move analyzers/fixers down to these shared layers. Thanks for breaking it up into different PRs!

[CyrusNajmabadi]

I can feel your pain, I ran into the same things when trying to move analyzers/fixers down to these shared layers. Thanks for breaking it up into different PRs!

yup yup. i had to do it in tiny bits. but it all worked out in the end.