Update swagger for Azure Monitor metrics query (#14609)

* Update swaggers for logs and metrics queries

* Update version

* add missing fields

* include statistics

* include statistics

* statistics in log query result

* Include metrics namespace param

* Update title and client name

* Include namespace param

* Add namespace and region

* Fix top and orderby query params

* Fix linting errors

* Update security to oauth2

* Remove logs query changes

* Update 2018-01-01 version and revert 2017-05-01-preview

Author: srnagar

specification/monitor/resource-manager/Microsoft.Insights/preview/2017-12-01-preview/metricNamespaces_API.json

@@ -2,9 +2,6 @@
   "swagger": "2.0",
   "info": {
     "title": "MonitorManagementClient",
-    "x-ms-code-generation-settings": {
-      "name": "MonitorManagementClient"
-    },
     "version": "2017-12-01-preview"
   },
   "host": "management.azure.com",
@@ -99,7 +96,7 @@
       ],
       "x-ms-enum": {
         "name": "NamespaceClassification",
-        "modelAsString": false
+        "modelAsString": true
       }
     },
     "MetricNamespace": {

specification/monitor/resource-manager/Microsoft.Insights/stable/2018-01-01/metricDefinitions_API.json

@@ -133,8 +133,8 @@
         "BitsPerSecond"
       ],
       "x-ms-enum": {
-        "name": "Unit",
-        "modelAsString": false
+        "name": "MetricUnit",
+        "modelAsString": true
       }
     },
     "AggregationType": {

specification/monitor/resource-manager/Microsoft.Insights/stable/2018-01-01/metrics_API.json

@@ -2,9 +2,6 @@
   "swagger": "2.0",
   "info": {
     "title": "MonitorManagementClient",
-    "x-ms-code-generation-settings": {
-      "name": "MonitorManagementClient"
-    },
     "version": "2018-01-01"
   },
   "host": "management.azure.com",
@@ -144,8 +141,8 @@
         "BitsPerSecond"
       ],
       "x-ms-enum": {
-        "name": "Unit",
-        "modelAsString": false
+        "name": "MetricUnit",
+        "modelAsString": true
       }
     },
     "MetricValue": {