Performance improvements

[greglook]

After doing a bit of profiling with clj-async-profiler, I noticed that some of the new formatting rules consume more CPU than they should need to. Of a sample flame graph where reformat-form took 43.47% of the measured CPU time, that time was spent:

• 21.25% cljstyle.format.type/reformat
• 8.85% cljstyle.format.indent/reindent
• 5.22%cljstyle.format.fn/line-break-functions
• 4.20% cljstyle.format.var/line-break-vars
• 3.95% other rules

This means that the type rules take almost half of the CPU time, despite type definitions being a small fraction of the actual code! It would be better to consider a more targeted approach, where the form is first searched for a relevant type form, then edits are applied to just that subform. The functions in rewrite-clj.zip.subedit might be useful for this.

[greglook]

Largely done in 0a125ab...b86b22f.