restore utils package exports in __init__.py

The exports were accidentally removed, breaking imports
for dependent packages like typedb.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: whummer

utils/localstack_extensions/utils/__init__.py

@@ -0,0 +1,23 @@
+from localstack_extensions.utils.docker import (
+    ProxiedDockerContainerExtension,
+    ProxyResource,
+)
+from localstack_extensions.utils.h2_proxy import (
+    TcpForwarder,
+    apply_http2_patches_for_grpc_support,
+    get_headers_from_data_stream,
+    get_headers_from_frames,
+    get_frames_from_http2_stream,
+    ProxyRequestMatcher,
+)
+
+__all__ = [
+    "ProxiedDockerContainerExtension",
+    "ProxyResource",
+    "TcpForwarder",
+    "apply_http2_patches_for_grpc_support",
+    "get_headers_from_data_stream",
+    "get_headers_from_frames",
+    "get_frames_from_http2_stream",
+    "ProxyRequestMatcher",
+]