feat(lsp): ability to configure document pre-load limit (#19097)

Adds a `deno.preloadLimit` option (ex. `"deno.preloadLimit": 2000`)
which specifies how many file entries to traverse on the file system
when the lsp loads or its configuration changes.

Closes #18955

cli/lsp/tsc.rs

@@ -3525,7 +3525,7 @@ mod tests {
     fixtures: &[(&str, &str, i32, LanguageId)],
     location: &Path,
   ) -> StateSnapshot {
-    let mut documents = Documents::new(location, Default::default());
+    let mut documents = Documents::new(location);
     for (specifier, source, version, language_id) in fixtures {
       let specifier =
         resolve_url(specifier).expect("failed to create specifier");