move plugins to extensions

packages/core/src/extensions/index.ts

@@ -2,9 +2,12 @@ export { Blur } from './blur'
 export { ClearContent } from './clearContent'
 export { ClearNodes } from './clearNodes'
 export { DeleteSelection } from './deleteSelection'
+export { Editable } from './editable'
 export { Focus } from './focus'
+export { FocusEvents } from './focusEvents'
 export { InsertHTML } from './insertHTML'
 export { InsertText } from './insertText'
+export { Keymap } from './keymap'
 export { LiftListItem } from './liftListItem'
 export { RemoveMark } from './removeMark'
 export { RemoveMarks } from './removeMarks'