feat: add inbound media understanding

Co-authored-by: Tristan Manchester <tmanchester96@gmail.com>

src/media-understanding/index.ts

@@ -0,0 +1,9 @@
+export { applyMediaUnderstanding } from "./apply.js";
+export { formatMediaUnderstandingBody } from "./format.js";
+export { resolveMediaUnderstandingScope } from "./scope.js";
+export type {
+  MediaAttachment,
+  MediaUnderstandingOutput,
+  MediaUnderstandingProvider,
+  MediaUnderstandingKind,
+} from "./types.js";