feat(kubectx): adding a new plugin for 'kubectx' (#6114)

Co-authored-by: Marc Cornellà <marc.cornella@live.com>
Co-authored-by: Robby Russell <robby@planetargon.com>

plugins/kubectx/kubectx.plugin.zsh

@@ -0,0 +1,14 @@
+typeset -A kubectx_mapping
+
+function kubectx_prompt_info() {
+  if [ $commands[kubectl] ]; then
+    local current_ctx=`kubectl config current-context`
+
+    #if associative array declared
+    if [[ -n $kubectx_mapping ]]; then
+      echo "${kubectx_mapping[$current_ctx]}"
+    else
+      echo $current_ctx
+    fi
+  fi
+}