CodeGen from PR 19357 in Azure/azure-rest-api-specs

[SRP] 2022-05-01 Swagger Api (#19357)

* Full copy from 2021-09-01 to 2022-05-01 without any changes

* Updating API version for Service types, Updating readme files

* Feature: add directoryServiceOptions AADKERB

* Add AADKERB to list of custom words

* Fix default version tag in readme.md

* Make encryption keySource optional

* Fix lint: add missing x-ms-enum

* Fix x-ms-enum at wrong level

* Make some activeDirectoryProperties optional

* Update readme.python.md

Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>