IPv6 support missing in DhcpServerDsc.OptionValueHelper functions

[coderabbitai]

Problem

The DhcpServerDsc.OptionValueHelper functions (Get-TargetResourceHelper, Set-TargetResourceHelper, Test-TargetResourceHelper) accept 'IPv6' in their AddressFamily parameter ValidateSet, but the implementation only calls DHCPServer v4 cmdlets (Get-DhcpServerv4OptionValue, Set-DhcpServerv4OptionValue, Remove-DhcpServerv4OptionValue).

This creates a mismatch between the interface contract and actual behavior, potentially leading to incorrect results when users specify IPv6.

Expected Behavior

Either:

1. Implement IPv6 support by calling appropriate v6 cmdlets when AddressFamily='IPv6'
2. Restrict the ValidateSet to only 'IPv4' until IPv6 is properly implemented

Current Workaround

Restrict AddressFamily parameter to only accept 'IPv4':

[ValidateSet('IPv4')]

References

• PR: Convert nested modules to buildable modules #96
• Comment: Convert nested modules to buildable modules #96 (comment)

Reported by: @dan-hughes