adding SQL DB migration cmdlets to AZ.DataMigration

[vasundhraManhas]

Description

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)
    • https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/1162
  • the markdown help files have been regenerated using the commands listed here

[vasundhraManhas]

@isra-fel The swagger has been merged : Azure/azure-rest-api-specs#18213

[isra-fel]

Looks good to me. But note that the skipped test cases must be enabled prior to Az.DataMigration module GA.

[vasundhraManhas]

Looks good to me. But note that the skipped test cases must be enabled prior to Az.DataMigration module GA.

Thank you so much!