init MetricsAdvisor (Azure#10862)

* init MetricsAdvisor

* fix errors and add readme.md

* fix errors

* fix warnings and add cSpell

* rename to custom-words.txt and fix warnings

* try to mitigate spell issue

* try to mitigate spell issue

* fix api version in swagger

* Update MetricsAdvisor.json

* Update MetricsAdvisor.json

* try to fix swagger validation issue

* try to fix validation issue

* add examples

* fix version

* validate'

* remove examples in main spec

* update examples

* rename request body param name in examples

* revert renaming req body name param in examples

* Update MetricsAdvisor.json

* fix x-ms-examples

* trigger validation

* fix examples

* fix examples

* Update getAnomalyAlertingConfiguration.json

* Update getActiveSeriesCount.json

* Update MetricsAdvisor.json

* Update MetricsAdvisor.json

* Update MetricsAdvisor.json

* Update MetricsAdvisor.json

* fix validation

* fix examples

* fix discriminator

* fix custom word

* fix custom word

Co-authored-by: Xiang Yan <xiangsjtu@gmail.com>

custom-words.txt

@@ -1051,6 +1051,7 @@ metricdefinitions
 metricmetadata
 metricnames
 metricnamespace
+metricsadvisor
 metrictype
 mgmt
 Mibps