10810: feat: Add toggle to disable cache priming r=jonas-schievink a=lnicola
Even if it doesn't prevent the rest of the features from working, cache priming tends to be quite CPU-intensive and can make people think that the load times are worse than they actually are.
It's also less useful in Code and `rust-tools` because the inlay hints and semantic highlighting trigger quite a bit of computation assuming you have a file open in the editor.
Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
4566414789