Macro swc_coverage_instrument::create_instrumentation_visitor

macro_rules! create_instrumentation_visitor {
    ($name:ident { $($vis: vis $field:ident: $t:ty),* $(,)? }) => { ... };
}

Expand given struct to contain necessary common filed for the coverage visitor with common utility functions.

This does not impl actual visitors (VisitMut) as each visitor may have different visitor logics.