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/suspend_source_bucket.go

@@ -28,6 +28,7 @@ var suspendSourceBucketCmd = &cobra.Command{
 	Long:  "The suspend command disables the reconciliation of a Bucket resource.",
 	Example: `  # Suspend reconciliation for an existing Bucket
   flux suspend source bucket podinfo`,
+	ValidArgsFunction: resourceNamesCompletionFunc(sourcev1.GroupVersion.WithKind(sourcev1.BucketKind)),
 	RunE: suspendCommand{
 		apiType: bucketType,
 		object:  bucketAdapter{&sourcev1.Bucket{}},