Azure Site Recovery - RCM multi appliance support

[pradheepm]

Description

This PR adds PowerShell support commands for V2A RCM provider Multi-appliance in RecoveryServices module. The PowerShell cmdlets are intended for VMware to Azure disaster recovery scenarios. Customers can use these cmdlets to protect their vCenter VMs/physical servers to Azure and reprotect them back to on-premises after a successful failover.

Swagger PR: Azure/azure-rest-api-specs#14794
SDK PR: Azure/azure-sdk-for-net#23501
Design Review: Azure/azure-powershell-cmdlet-review-pr#1010

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • PowerShell support for V2A RCM provider switch appliance in Azure Site Recovery #1010
  • the markdown help files have been regenerated using the commands listed here

[pradheepm]

Design review yet to complete.
PowerShell support for V2A RCM provider switch appliance in Azure Site Recovery #1010