Specify a schema to use when dealing with JSONC files (#44250)

Follow-up of https://github.com/zed-industries/zed/pull/43854
Closes https://github.com/zed-industries/zed/issues/40970

Seems that json language server does not distinguish between JSONC and
JSON files in runtime, but there is a static schema, which accepts globs
in its `fileMatch` fields.

Use all glob overrides and file suffixes for JSONC inside those match
fields, and provide a grammar for such matches, which accepts trailing
commas.

Release Notes:

- Improved JSONC trailing comma handling

crates/language/src/language_registry.rs

@@ -745,7 +745,7 @@ impl LanguageRegistry {
         self: &Arc<Self>,
         path: &Path,
         content: Option<&Rope>,
-        user_file_types: Option<&FxHashMap<Arc<str>, GlobSet>>,
+        user_file_types: Option<&FxHashMap<Arc<str>, (GlobSet, Vec<String>)>>,
     ) -> Option<AvailableLanguage> {
         let filename = path.file_name().and_then(|filename| filename.to_str());
         // `Path.extension()` returns None for files with a leading '.'
@@ -788,7 +788,7 @@ impl LanguageRegistry {
             let path_matches_custom_suffix = || {
                 user_file_types
                     .and_then(|types| types.get(language_name.as_ref()))
-                    .map_or(None, |custom_suffixes| {
+                    .map_or(None, |(custom_suffixes, _)| {
                         path_suffixes
                             .iter()
                             .find(|(_, candidate)| custom_suffixes.is_match_candidate(candidate))

crates/language/src/language_settings.rs

@@ -51,7 +51,7 @@ pub struct AllLanguageSettings {
     pub edit_predictions: EditPredictionSettings,
     pub defaults: LanguageSettings,
     languages: HashMap<LanguageName, LanguageSettings>,
-    pub(crate) file_types: FxHashMap<Arc<str>, GlobSet>,
+    pub file_types: FxHashMap<Arc<str>, (GlobSet, Vec<String>)>,
 }
 
 #[derive(Debug, Clone, PartialEq)]
@@ -656,7 +656,7 @@ impl settings::Settings for AllLanguageSettings {
 
         let enabled_in_text_threads = edit_predictions.enabled_in_text_threads.unwrap();
 
-        let mut file_types: FxHashMap<Arc<str>, GlobSet> = FxHashMap::default();
+        let mut file_types: FxHashMap<Arc<str>, (GlobSet, Vec<String>)> = FxHashMap::default();
 
         for (language, patterns) in all_languages.file_types.iter().flatten() {
             let mut builder = GlobSetBuilder::new();
@@ -665,7 +665,10 @@ impl settings::Settings for AllLanguageSettings {
                 builder.add(Glob::new(pattern).unwrap());
             }
 
-            file_types.insert(language.clone(), builder.build().unwrap());
+            file_types.insert(
+                language.clone(),
+                (builder.build().unwrap(), patterns.0.clone()),
+            );
         }
 
         Self {