Add SDK for database recovery on Managed Instance

[lixiachena]

Swagger PR Links
Azure/azure-rest-api-specs#4947

Add SDK for database recovery on Managed Instance

•Add getrecoverabledatabases on managed instance and create databases using geo-backup

•Add test

•Generate client from azure and update session records

•Add release notes

Description

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• Please add REST spec PR link to the SDK PR
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• Pull request includes test coverage for the included changes.

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[dsgouda]

LGTM