CodeGen from PR 16152 in Azure/azure-rest-api-specs

[Hub Generated] Public private branch 'dev-storagecache-Microsoft.StorageCache-2021-09-01' (#16152)

* Adds base for updating Microsoft.StorageCache from version stable/2021-05-01 to version 2021-09-01

* Updates readme

* Updates API version in new specs and examples

* 2021-09-01 API

* Fix LintDiff

Co-authored-by: rebecca337 <80353400+rebecca337@users.noreply.github.com>
Co-authored-by: Rebecca Dupuis <rdupuis@microsoft.com>

Author: SDKAuto