feat(editor): eslint/tsconfig migration + type fixes

@robonen/editor: migrate to eslint flat config + composite tsconfig; fix
convergence test type annotations.

vue/editor/src/keymap/index.ts

@@ -0,0 +1,5 @@
+export * from './types';
+export * from './normalize';
+export * from './compile';
+export * from './defaults';
+export * from './dispatcher';