feat: add uc ps command to list all containers in the cluster (#165)

* feat: Add `uc ps` command to list all containers in the cluster

* Fix indentation

* Improvements to the container state highlights code (use enum, better var naming)

* Add group/sort option by "health"

* Rename `uc ps --group-by` flag to `--sort`. Also, remove `--context` flag.

* Use huh.spinner with standard style/type

* Remove pointless TrimPrefix on container name

* Move machine lookup out of services loop

* Use more efficient `ListServiceContainers`

* Use consistent header other

* Use api.ProxyMachinesContext helper for context to query all machines for service containers

* Make errored MachineServiceContainer entries a warning, not return an error immediately, in `uc ps`

* Use lipgloss table instead of tabwriter for "uc ps" command

* Handle nil metadata in `uc ps` on container when cluster only has one machine

cmd/uncloud/main.go

@@ -112,6 +112,7 @@ func main() {
 		NewDocsCommand(),
 		NewBuildCommand(),
 		NewImagesCommand(),
+		NewPsCommand(),
 		caddy.NewRootCommand(),
 		cmdcontext.NewRootCommand(),
 		dns.NewRootCommand(),