feat: add support for managing vCenter Single Sign-on domain local users and groups

[FlxPeters]

Description

Resolves #1413 - Add support to manage vCenter users and groups.

Note: This is a draft for now. Further resources and data sources are in progress. I want early feedback, especially on the dynamic token implementation, since it introduces a new pattern to the provider.

Acceptance tests

• [ ] Have you added an acceptance test for the functionality being added?
• [ ] Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

• govc SSO client implementation: https://github.com/vmware/govmomi/blob/main/govc/sso/client.go

[hashicorp-cla]

All committers have signed the CLA.

[tenthirtyam]

Is work continuing on this pull request?

[FlxPeters]

I'm waiting for feedback in the issue: https://github.com/hashicorp/terraform-provider-vsphere/issues/1413#issuecomment-1793651584

Main problem is how to handle the client. It requires non of the existing ones. Any suggestions here? Technically it's a solvable issue, I'm just not sure what's the best way

[FlxPeters]

Thanks for the feedback! So there is no proper way to implement this yet, right?

[tenthirtyam]

Unfortunately, not currently.

[github-actions[bot]]

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