Add -ApiVersion to Register-PSResourceRepository

[alerickson]

PR Summary

This PR adds the parameter ApiVersion to Register-PSResourceRepository.

PR Context

Needed for PR #1425
Also resolves #1417

PR Checklist

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• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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• Breaking changes
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  • Documentation needed
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• User-facing changes
  • Not Applicable
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  • Documentation needed
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• Testing - New and feature
  • N/A or can only be tested interactively
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• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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