[feature request] Export manifests to KYAML

[mathieu-benoit]

Kubernetes 1.34 is bringing a new format and extension file: KYAML.

It would be great to discuss and see if/how we can support this with score-k8s generate as an option.

Reference: https://kubernetes.io/blog/2025/07/28/kubernetes-v1-34-sneak-peek/#support-for-kyaml-a-kubernetes-dialect-of-yaml

KYAML aims to be a safer and less ambiguous YAML subset, and was designed specifically for Kubernetes. Whatever version of Kubernetes you use, you'll be able use KYAML for writing manifests and/or Helm charts. You can write KYAML and pass it as an input to any version of kubectl, because all KYAML files are also valid as YAML. With kubectl v1.34, we expect you'll also be able to request KYAML output from kubectl (as in kubectl get -o kyaml …). If you prefer, you can still request the output in JSON or YAML format.