message: Add billing time grains to budget properties
diff: "enum": [
  "Monthly",
  "Quarterly",
  - "Annually"
  + "Annually",
  + "BillingMonth",
  + "BillingQuarter",
  + "BillingAnnual"
  ],
  "x-ms-enum": {
  "name": "TimeGrainType",
  