Add Bun.JSONC API for parsing JSON with comments and trailing commas (#22115)

## Summary

This PR implements a new `Bun.JSONC.parse()` API that allows parsing
JSONC (JSON with Comments) files. It addresses the feature request from
issue #16257 by providing a native API for parsing JSON with comments
and trailing commas.

The implementation follows the same pattern as `Bun.YAML` and
`Bun.TOML`, leveraging the existing `TSConfigParser` which already
handles JSONC parsing internally.

## Features

- **Parse JSON with comments**: Supports both `//` single-line and `/*
*/` block comments
- **Handle trailing commas**: Works with trailing commas in objects and
arrays
- **Full JavaScript object conversion**: Returns native JavaScript
objects/arrays
- **Error handling**: Proper error throwing for invalid JSON
- **TypeScript compatibility**: Works with TypeScript config files and
other JSONC formats

## Usage Example

```javascript
const result = Bun.JSONC.parse(`{
  // This is a comment
  "name": "my-app",
  "version": "1.0.0", // trailing comma is allowed
  "dependencies": {
    "react": "^18.0.0",
  },
}`);
// Returns native JavaScript object
```

## Implementation Details

- Created `JSONCObject.zig` following the same pattern as
`YAMLObject.zig` and `TOMLObject.zig`
- Uses the existing `TSConfigParser` from `json.zig` which already
handles comments and trailing commas
- Added proper C++ bindings and exports following Bun's established
patterns
- Comprehensive test suite covering various JSONC features

## Test Plan

- [x] Basic JSON parsing works
- [x] Single-line comments (`//`) are handled correctly
- [x] Block comments (`/* */`) are handled correctly  
- [x] Trailing commas in objects and arrays work
- [x] Complex nested structures parse correctly
- [x] Error handling for invalid JSON
- [x] Empty objects and arrays work
- [x] Boolean and null values work correctly

🤖 Generated with [Claude Code](https://claude.ai/code)

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
Co-authored-by: Jarred-Sumner <709451+Jarred-Sumner@users.noreply.github.com>

packages/bun-types/bun.d.ts

@@ -625,6 +625,33 @@ declare module "bun" {
     export function parse(input: string): object;
   }
 
+  /**
+   * JSONC related APIs
+   */
+  namespace JSONC {
+    /**
+     * Parse a JSONC (JSON with Comments) string into a JavaScript value.
+     *
+     * Supports both single-line (`//`) and block comments (`/* ... *\/`), as well as
+     * trailing commas in objects and arrays.
+     *
+     * @category Utilities
+     *
+     * @param input The JSONC string to parse
+     * @returns A JavaScript value
+     *
+     * @example
+     * ```js
+     * const result = Bun.JSONC.parse(`{
+     *   // This is a comment
+     *   "name": "my-app",
+     *   "version": "1.0.0", // trailing comma is allowed
+     * }`);
+     * ```
+     */
+    export function parse(input: string): unknown;
+  }
+
   /**
    * YAML related APIs
    */