feat/Created new pinia store for budget

src/stores/BudgetStore.ts

+import { defineStore } from 'pinia'
+
+export const useBudgetStore = defineStore('BudgetStore', {
+  state: () => ({
+    activeBudgetId: 0,
+  }),
+  actions: {
+    setActiveBudgetId(id: number) {
+      this.activeBudgetId = id
+    }
+  },
+  getters: {
+    getActiveBudgetId(): number {
+      return this.activeBudgetId
+    }
+  },
+  persist: {
+    storage: sessionStorage
+  }
+});