refactor: break up ProcState (#18707)

1. Breaks up functionality within `ProcState` into several other structs
to break out the responsibilities (`ProcState` is only a data struct
now).
2. Moves towards being able to inject dependencies more easily and have
functionality only require what it needs.
3. Exposes `Arc<T>` around the "service structs" instead of it being
embedded within them. The idea behind embedding them was to reduce the
verbosity of needing to pass around `Arc<...>`, but I don't think it was
exactly working and as we move more of these structs to be more
injectable I don't think the extra verbosity will be a big deal.

cli/tools/coverage/mod.rs

@@ -697,8 +697,7 @@ pub async fn cover_files(
       | MediaType::Mts
       | MediaType::Cts
       | MediaType::Tsx => {
-        let source_hash = ps.emitter.get_source_hash(&file.source);
-        match ps.emit_cache.get_emit_code(&file.specifier, source_hash) {
+        match ps.emitter.maybed_cached_emit(&file.specifier, &file.source) {
           Some(code) => code.into(),
           None => {
             return Err(anyhow!(