refactor(store)!: remove pinia

* replace pinia with a reactive state object and inject/provide

Signed-off-by: Braks <78412429+bcakmakoglu@users.noreply.github.com>

update(store)!: inject store if possible, otherwise create a new one by id

Signed-off-by: Braks <78412429+bcakmakoglu@users.noreply.github.com>

src/composables/useVueFlow.ts

@@ -1,10 +1,12 @@
 import useStore from './useStore'
 import useHooks from './useHooks'
-import { EmitFunc, FlowOptions, FlowStore } from '~/types'
+import { EmitFunc, ReactiveFlowStore } from '~/types'
 
-export const initFlow = (emit: EmitFunc, key?: string, store = useStore(undefined, key)) => {
+let key = 0
+export const initFlow = (emit: EmitFunc, id = `vue-flow-${key++}`): ReactiveFlowStore => {
+  const store = useStore({ id })
   useHooks(store, emit)
   return store
 }
 
-export default (options?: Partial<FlowOptions>): FlowStore => useStore(options)
+export default useStore