feat!: move msteams to plugin

extensions/msteams/src/attachments.ts

@@ -0,0 +1,14 @@
+export { downloadMSTeamsImageAttachments } from "./attachments/download.js";
+export { buildMSTeamsGraphMessageUrls, downloadMSTeamsGraphMedia } from "./attachments/graph.js";
+export {
+  buildMSTeamsAttachmentPlaceholder,
+  summarizeMSTeamsHtmlAttachments,
+} from "./attachments/html.js";
+export { buildMSTeamsMediaPayload } from "./attachments/payload.js";
+export type {
+  MSTeamsAccessTokenProvider,
+  MSTeamsAttachmentLike,
+  MSTeamsGraphMediaResult,
+  MSTeamsHtmlAttachmentSummary,
+  MSTeamsInboundMedia,
+} from "./attachments/types.js";