feat: add useStore and useHooks composables that provide default store/hooks

src/context/index.ts

@@ -1,6 +1,6 @@
 import { InjectionKey } from 'vue'
-import { FlowHooks, FlowStore } from '~/types'
+import { ElementId, FlowHooks, FlowStore } from '~/types'
 
 export const Store: InjectionKey<FlowStore> = Symbol('store')
 export const Hooks: InjectionKey<FlowHooks> = Symbol('hooks')
-export const NodeIdContextKey: InjectionKey<string> = Symbol('NodeIdContext')
+export const NodeIdContextKey: InjectionKey<ElementId> = Symbol('NodeIdContext')