Add a flag to analysis-stats to trigger syntax highlighting and inlay hints on all files

[Veykril]

These two IDE features kick off a lot of IDE level hir things, so I feel like we could get a better grasp of memory usage on projects with these being run. I'm not proposing to run this on CI as that will blow up metric time a lot, but it might make for a nice tool to check just how expensive we are on memory when someone has been workin on their project for a longer time, as most memory usage complains come from people that haven't ended their editor session in a long time (and r-a currently doesn't free any up to date caching results).