Add dynamic completion suppport

This commit adds dynamic completion support for the following commands
and flags:

- `flux delete ...` command
- `flux export ...` command
- `flux get ...` command
- `flux reconcile ...` command
- `flux resume ...` command
- `flux suspend ...` command
- `--namespace` flag
- `--context` flag

Signed-off-by: Kazuki Suda <kazuki.suda@gmail.com>

cmd/flux/delete_image_policy.go

@@ -28,6 +28,7 @@ var deleteImagePolicyCmd = &cobra.Command{
 	Long:  "The delete image policy command deletes the given ImagePolicy from the cluster.",
 	Example: `  # Delete an image policy
   flux delete image policy alpine3.x`,
+	ValidArgsFunction: resourceNamesCompletionFunc(imagev1.GroupVersion.WithKind(imagev1.ImagePolicyKind)),
 	RunE: deleteCommand{
 		apiType: imagePolicyType,
 		object:  universalAdapter{&imagev1.ImagePolicy{}},