Factor out markdown widget rendering

plug-api/app_event.ts

@@ -54,6 +54,7 @@ export type CompleteEvent = {
 export type WidgetContent = {
   html?: string;
   script?: string;
+  markdown?: string;
   url?: string;
   height?: number;
   width?: number;

plug-api/types.ts

@@ -115,3 +115,14 @@ export type ObjectValue<T> = {
 } & T;
 
 export type ObjectQuery = Omit<Query, "prefix">;
+
+// Code widget stuff
+export type CodeWidgetCallback = (
+  bodyText: string,
+) => Promise<CodeWidgetContent>;
+
+export type CodeWidgetContent = {
+  html?: string;
+  markdown?: string;
+  script?: string;
+};