Is your feature request related to a problem? Please describe.
I find it difficult to find CRDs when I type ":crds". There are a lot of CRDs, and they are alphabetically ordered. Also, I can't search them by a part of their name (some of them have long names).

Describe the solution you'd like
I'd like to see the CRDs grouped by their group (such as the cert-manager.io group).

Describe alternatives you've considered

1. In the views.yaml columns section, allow to specify an attribute from the resource (such as spec.group). May be like this:

# $XDG_CONFIG_HOME/k9s/views.yaml
views:
  apiextensions.k8s.io/v1/customresourcedefinitions:
    # Overrides default sort column
    sortColumn: GROUP:asc
    columns:
      - NAME
      - VERSIONS
      - GROUP:.spec.group
      - AGE

2. A plugin that shows the CRDs, but sorted by their group. I wrote a plugin like that, but it would be good to have this feature without the need for another plugin.

# $XDG_CONFIG_HOME/k9s/plugins.yaml
plugins:
  sort-crds-by-group:
    shortCut: s
    confirm: false
    description: Sort CRDs
    scopes:
      - customresourcedefinitions
    command: sh
    background: false
    args:
      - -c
      - "kubectl get crds -o=custom-columns=NAME:.metadata.name,GROUP:.spec.group --sort-by=.spec.group --context $CONTEXT | less -K"

Additional context

The first alternative would be similar to sorting the pods by their namespace, such as: