CodeGen from PR 21160 in Azure/azure-rest-api-specs

[Hub Generated] Review request for Microsoft.Media/Encoding to add version preview/2022-05-01-preview (#21160)

* Adds base for updating Microsoft.Media/Encoding from version stable/2021-11-01 to version 2022-05-01-preview

* Updates readme

* Updates API version in new specs and examples

* Copy over the swagger files for 2022-05-01-preview

* Fix validation failures

* Fix validation failures

* Fix validation failures II

* Fix readme file

* Fix readme file II

* Fix readme file III

* Restore the original order of the existing models

* Revert the casing change in api version description