`Isolate.packageConfigSync` and `Isolate.resolvePackageUriSync` APIs are missing in Dart v3.1

[halildurmus]

These APIs are documented in the CHANGELOG under the v3.1.0:

sdk/CHANGELOG.md

Lines 119 to 121 in cfa03ed

	#### `dart:isolate`
	- Added `Isolate.packageConfigSync` and `Isolate.resolvePackageUriSync` APIs.

However, they seem to be missing in Dart v3.1.

Here's the link to the Isolate class from the stable branch: https://github.com/dart-lang/sdk/blob/stable/sdk/lib/isolate/isolate.dart

In the main branch, these APIs are defined as:

sdk/sdk/lib/isolate/isolate.dart

Lines 345 to 346 in cfa03ed

	@Since('3.1')
	external static Uri? get packageConfigSync;

sdk/sdk/lib/isolate/isolate.dart

Lines 396 to 397 in cfa03ed

	@Since('3.1')
	external static Uri? resolvePackageUriSync(Uri packageUri);

Here's the commit where these APIs are added: 4fddaf9

Dart version:

Dart SDK version: 3.1.0 (stable) (Tue Aug 15 21:33:36 2023 +0000) on "windows_x64"

[24junio200892]

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