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/languages/src/lib.rs

@@ -45,6 +45,7 @@ pub fn init(
         ("gowork", tree_sitter_gowork::language()),
         ("jsdoc", tree_sitter_jsdoc::language()),
         ("json", tree_sitter_json::language()),
+        ("jsonc", tree_sitter_json::language()),
         ("markdown", tree_sitter_markdown::language()),
         ("proto", tree_sitter_proto::language()),
         ("python", tree_sitter_python::language()),
@@ -126,6 +127,14 @@ pub fn init(
         ],
         json_task_context()
     );
+    language!(
+        "jsonc",
+        vec![Arc::new(json::JsonLspAdapter::new(
+            node_runtime.clone(),
+            languages.clone(),
+        ))],
+        json_task_context()
+    );
     language!("markdown");
     language!(
         "python",