Allow Custom IP Range Configuration to Avoid Network Conflicts

[marsaultj]

Is your feature request related to a problem? Please describe.
I'm currently facing a limitation with the hardcoded IP address range "10.8.0.0/24" in the VPN project. In my environment, this range conflicts with existing network configurations, which causes connectivity issues and prevents me from integrating the VPN into my network seamlessly.

Describe the solution you'd like
I would like the VPN project to support configurable IP address ranges for client assignments. This would allow users to specify a custom IP range that fits their network environment, avoiding any potential conflicts with existing setups.

Describe alternatives you've considered
I'm not sure there is a alternative solution. The hard-coded IP range seems to be a fundamental limitation that cannot be easily circumvented without the proposed functionality.

Additional context
Allowing for a configurable IP range would greatly enhance the flexibility and adaptability of the VPN project for various use cases.