kubernetes: Add styling based on current namespace and/or context

[daftping]

Feature Request

In the current implementation, it is impossible to customize the style based on the Kubernetes namespace, only the Kubernetes context is supported.
One of the common patterns is to have dev and prod namespaces on the same pool of clusters so it is impossible to change style based on the cluster name and you can rely only on the namespace name. For example:

context: foo namespace: dev-bar
context: foo namespace: prod-bar
context: baz namespace: dev-bar
context: baz namespace: prod-bar

Is your feature request related to a problem? Please describe.

Original implementation #4550

Describe the solution you'd like

[kubernetes]
format = 'on [⛵ ($user on )($cluster in )$context \($namespace\)](dimmed green) '
disabled = false
contexts = [
  { namespace_pattern = "dev-.*", style = "green", symbol = "🟢 " },
  { context_pattern = "int.*", namespace_pattern = "prod-.*", style = "yellow" },
  { namespace_pattern = "prod-.*", style = "red", symbol = "🚨 "  },
]

Describe alternatives you've considered

I am not aware of any possible workarounds