[WIP] vsock: Add new VMs at runtime

[techiepriyansh]

Implement ability to add new VMs at runtime. Removing or modifying the configuration of an existing VM at runtime is not supported at the moment.

To use this feature, you must use the --config CLI argument to specify the initial configuration with the --watch flag set. The path to the config file provided must be a symlink to the actual YAML config. To update the VM configuration at runtime, simply change the symlink to point to the YAML config file with the new configuration.