feat(kompost): Add plugin for kompose (#7729)

Co-authored-by: Kevin S Kirkup <kevin.kirkup@pureport.com>

plugins/kompose/README.md

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+# kompose
+
+This plugin provides completion for [kompose](https://github.com/kubernetes/kompose),
+to migrate from docker compose to Kubernetes resource definitions.
+
+To use it, add `kompose` to the plugins array in your zshrc file.
+
+```
+plugins=(... kompose)
+```
+
+**Author:** [@kevinkirkup](https://github.com/kevinkirkup)

plugins/kompose/kompose.plugin.zsh

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+if [ $commands[kompose] ]; then
+  source <(kompose completion zsh)
+fi