Add createdAt and metadata to container, network, and volume resources

[solventak]

Closes #791 , #665

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Motivation and Context

Add createdAt metadata (generic metadata struct) for each Container, Volume, and Network as well as output in ls commands to display it.

Also fixes a bug when spawning networkvmnet.service where instead of initializing the network configuration from the stored information of NetworkConfiguration entity it would create a new configuration based on key metadata that was passed in through args.

Testing

• Tested locally
• Added/updated tests
• Added/updated docs

[solventak]

@jglogan for your consideration :)

[saehejkang]

@solventak I’ve been actively working on this issue and already have #791 open (as you noted above). I was waiting on reviews and responses to a few questions before making further updates. Please check if an issue is already in progress before starting work on it. I would have been more than happy to coordinate with you, if you wanted to tackle this issue 💯 .