Consolidate network creation functionality into Netavark (nv). This will centralize network management logic and reduce code duplication between Podman and Netavark.

This story involves:

• Moving network creation logic from Podman to Netavark
• Updating Podman to delegate network creation to Netavark
• Removing duplicated network creation code from Podman and c/common
• Updating documentation to reflect the consolidated architecture
• Adding tests to validate network creation via Netavark

Reference: Podman 6 High Level Design