Add Bun.YAML.parse and YAML imports (#22073)

### What does this PR do?
This PR adds builtin YAML parsing with `Bun.YAML.parse`
```js
import { YAML } from "bun";
const items = YAML.parse("- item1");
console.log(items); // [ "item1" ]
```

Also YAML imports work just like JSON and TOML imports
```js
import pkg from "./package.yaml"
console.log({ pkg }); // { pkg: { name: "pkg", version: "1.1.1" } }
```
### How did you verify your code works?
Added some tests for YAML imports and parsed values.

---------

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>

packages/bun-native-bundler-plugin-api/bundler_plugin.h

@@ -18,9 +18,11 @@ typedef enum {
   BUN_LOADER_BASE64 = 10,
   BUN_LOADER_DATAURL = 11,
   BUN_LOADER_TEXT = 12,
+  BUN_LOADER_HTML = 17,
+  BUN_LOADER_YAML = 18,
 } BunLoader;
 
-const BunLoader BUN_LOADER_MAX = BUN_LOADER_TEXT;
+const BunLoader BUN_LOADER_MAX = BUN_LOADER_YAML;
 
 typedef struct BunLogOptions {
   size_t __struct_size;