Add separate JSONC language (#12655)

Resolves https://github.com/zed-industries/extensions/issues/860 and
https://github.com/zed-industries/zed/issues/10921, also
https://github.com/biomejs/biome-zed/issues/11.

### Problem:
When opening .json files, zed allows comments by default in the JSON
language, which can cause some problems.
For example, language-servers also get "json" as the language, which may
show errors for those comments.

<img width="935" alt="image"
src="https://github.com/zed-industries/zed/assets/10381895/fed3d83d-abc0-44b5-9982-eb249bb04c3b">

### Solution:

This PR adds a JSONC language. 

<img width="816" alt="image"
src="https://github.com/zed-industries/zed/assets/10381895/8b40e671-d4f0-4e8d-80cb-82ee7c0ec490">

This allows for more specific configuration for language servers. 
Also any json file can be set explicitly to be JSONC using the
file_types setting:

```jsonc
{
  "file_types": {
    // set all .json files to be seen as JSONC
    "JSONC": ["*.json"]
  }
}
```


Release Notes:

- N/A

crates/language/src/language_registry.rs

@@ -511,7 +511,7 @@ impl LanguageRegistry {
     ) -> impl Future<Output = Result<Arc<Language>>> {
         let filename = path.file_name().and_then(|name| name.to_str());
         let extension = path.extension_or_hidden_file_name();
-        let path_suffixes = [extension, filename];
+        let path_suffixes = [extension, filename, path.to_str()];
         let empty = GlobSet::empty();
 
         let rx = self.get_or_load_language(move |language_name, config| {