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/jsonc/brackets.scm

@@ -0,0 +1,3 @@
+("[" @open "]" @close)
+("{" @open "}" @close)
+("\"" @open "\"" @close)

crates/languages/src/jsonc/config.toml

@@ -0,0 +1,12 @@
+name = "JSONC"
+grammar = "jsonc"
+path_suffixes = ["jsonc"]
+line_comments = ["// "]
+autoclose_before = ",]}"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false, not_in = ["string"] },
+]
+tab_size = 2
+prettier_parser_name = "jsonc"

crates/languages/src/jsonc/embedding.scm

@@ -0,0 +1,14 @@
+; Only produce one embedding for the entire file.
+(document) @item
+
+; Collapse arrays, except for the first object.
+(array
+  "[" @keep
+  .
+  (object)? @keep
+  "]" @keep) @collapse
+
+; Collapse string values (but not keys).
+(pair value: (string
+  "\"" @keep
+  "\"" @keep) @collapse)

crates/languages/src/jsonc/highlights.scm

@@ -0,0 +1,21 @@
+(comment) @comment
+
+(string) @string
+
+(pair
+  key: (string) @property.json_key)
+
+(number) @number
+
+[
+  (true)
+  (false)
+  (null)
+] @constant
+
+[
+  "{"
+  "}"
+  "["
+  "]"
+] @punctuation.bracket

crates/languages/src/jsonc/indents.scm

@@ -0,0 +1,2 @@
+(array "]" @end) @indent
+(object "}" @end) @indent

crates/languages/src/jsonc/outline.scm

@@ -0,0 +1,2 @@
+(pair
+  key: (string (string_content) @name)) @item

crates/languages/src/jsonc/overrides.scm

@@ -0,0 +1 @@
+(string) @string

crates/languages/src/jsonc/redactions.scm

@@ -0,0 +1,4 @@
+(pair value: (number) @redact)
+(pair value: (string) @redact)
+(array (number) @redact)
+(array (string) @redact)