feat: Bindings for vSphere Zone APIs

[spacegospod]

Description

Adding bindings for the consumption domains API (a.k.a. vSphere Zones)

Related: hashicorp/terraform-provider-vsphere#2185

Type of change

Please mark options that are relevant:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• This change requires a documentation update
• Build related change

How Has This Been Tested?

Tested against a live VC.
Created a simulator for the new endpoints and added a unit test that verifies the contract.

Checklist:

• My code follows the CONTRIBUTION guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

[dougm]

Thanks @spacegospod , a few suggestions

[dougm]

lgtm, thanks @spacegospod !