feat: support to add and remove cross-instance t1 gateway

[slakshmanan2706]

• Added Get-NsxtGlobalManagerTier0Gateway cmdlet to retrieve a list of Tier-0 gateways from the NSX Global Manager.
• Added Get-NsxtGlobalManagerTier1Gateway cmdlet to retrieve a list of Tier-1 gateways from the NSX Global Manager.
• Added Get-NsxtGlobalManagerEdgeClusters cmdlet to retrieve the NSX Edge cluster information for the specified site.
• Added Get-NsxtGlobalManagerTier1LocaleServices cmdlet to retrieve the locale services of the Tier-1 gateway from the NSX Global Manager.
• Added New-NsxtGlobalManagerTier1Gateway cmdlet to create a Teir 1 Gateway on the NSX Global Manager.
• Added New-NsxtGlobalManagerTier1LocaleServices cmdlet to create locale services on the Teir 1 Gateway.
• Added Add-NsxtGlobalManagerTier1Gateway cmdlet to create a Tier 1 Gateway on the NSX Global Manager.
• Added Remove-NsxtGlobalManagerTier1Gateway cmdlet to delete the Tier 1 Gateway from the NSX Global Manager.
• Added Remove-NsxtGlobalManagerTier1LocaleServices cmdlet to delete the locale service of Tier 1 Gateway from the NSX Global Manager.
• Added Undo-NsxtGlobalManagerTier1Gateway cmdlet to remove the Tier 1 Gateway from the NSX Global Manager.

Summary

Type

• [ ] Bugfix
• [x] Enhancement or Feature
• [ ] Code Style or Formatting
• [ ] Documentation
• [ ] Refactoring
• [ ] Chore
• [ ] Other Please describe:

Breaking Changes?

• [ ] Yes, there are breaking changes.
• [x] No, there are no breaking changes.

Test and Documentation

• [x] Tests have been completed.
• [ ] Documentation has been added or updated.

Issue References

Additional Information

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