chore: establish learning module baseline

OpenMAIC/lib/document/extract-media.ts

@@ -0,0 +1,11 @@
+import { selectMediaExtractorProvider } from './extractors/media-registry';
+import type { MediaArtifact, MediaExtractorInput } from './types';
+
+export async function extractMedia(input: MediaExtractorInput): Promise<MediaArtifact> {
+  const provider = selectMediaExtractorProvider({
+    mimeType: input.mimeType,
+    preferredProviderId: input.config.providerId,
+  });
+
+  return provider.extract(input);
+}