feat(types): export more emit related types (#11017)

Co-authored-by: Evan You <[email protected]>

Author: buqiyuan

Diff for: packages/runtime-core/src/index.ts

@@ -278,6 +278,8 @@ export type {
   EmitsOptions,
   ObjectEmitsOptions,
   EmitsToProps,
+  ShortEmitsToObject,
+  EmitFn,
 } from './componentEmits'
 export type {
   ComponentPublicInstance,