message: add xms-ids for postgresql
diff: "items": {
  "$ref": "#/definitions/DelegatedSubnetUsage"
  },
  + "x-ms-identifiers": [
  + "subnetName"
  + ],
  "readOnly": true
  }
  },
  "items": {
  "$ref": "#/definitions/VcoreCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "readOnly": true
  },
  "status": {
  "items": {
  "$ref": "#/definitions/StorageMBCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "readOnly": true
  },
  "status": {
  "items": {
  "$ref": "#/definitions/StorageEditionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "description": "The list of editions supported by this server edition.",
  "readOnly": true
  },
  "items": {
  "$ref": "#/definitions/ServerVersionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "description": "The list of server versions supported by this server edition.",
  "readOnly": true
  },
  "items": {
  "$ref": "#/definitions/StorageEditionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "description": "The list of editions supported by this server edition.",
  "readOnly": true
  },
  "items": {
  "$ref": "#/definitions/ServerVersionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "description": "The list of server versions supported by this server edition.",
  "readOnly": true
  },
  "items": {
  "$ref": "#/definitions/NodeTypeCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "description": "The list of Node Types supported by this server edition.",
  "readOnly": true
  },
  "items": {
  "$ref": "#/definitions/FlexibleServerEditionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "readOnly": true
  },
  "supportedHyperscaleNodeEditions": {
  "items": {
  "$ref": "#/definitions/HyperscaleNodeEditionCapability"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "readOnly": true
  },
  "supportedHAMode": {
  "items": {
  "$ref": "#/definitions/CapabilityProperties"
  },
  + "x-ms-identifiers": [
  + "zone"
  + ],
  "readOnly": true
  },
  "nextLink": {
  "type": "array",
  "items": {
  "$ref": "#/definitions/Operation"
  - }
  + },
  + "x-ms-identifiers": [
  + "name"
  + ]
  },
  "nextLink": {
  "description": "URL client should use to fetch the next page (per server side paging).\r\nIt's null for now, added for future use.",
  