[WIP]add playground catalog command

[lalyos]

No description provided.

[lalyos]

I've added an optional --filter
I've identified 3 possible values from inspecting the webui:

• my-custom
• popular
• recent

$ labctl p cat -f my-custom
Available playgrounds:
  - custom-1a7d32b1 - Single node k3s witch VCluster cli installed.
  - custom-69a0252b - Like the single node k3s cluster, but traefik,localstore and loadbalancers are enabled.

$ labctl p cat -f popular
Available playgrounds:
  - docker - A Linux server with Docker engine pre-installed.
  - k3s - A multi-node K3s cluster with a load balancer, Helm, and more.
  - mini-lan-ubuntu-docker - Three Ubuntu servers with Docker pre-installed connected into a single network.
  - ubuntu-24-04 - A vanilla Ubuntu 24.04 server.
 
$ labctl p cat -f recent
Available playgrounds:
  - alpine - A lightweight Alpine Linux server.
  - custom-1a7d32b1 - Single node k3s witch VCluster cli installed.
  - custom-20577521 -
  - docker - A Linux server with Docker engine pre-installed.
  - k3s - A multi-node K3s cluster with a load balancer, Helm, and more.
  - k3s-bare - A single-node cluster with most of the K3s bells and whistles disabled.
  - ubuntu-24-04 - A vanilla Ubuntu 24.04 server.

[iximiuz]

Thanks a lot for the handy command @lalyos!