Make transit import command work for the transform backend (#20668)

* Add import and import-version commands for the transform backend

command/transform.go

@@ -0,0 +1,41 @@
+package command
+
+import (
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
+
+var _ cli.Command = (*TransformCommand)(nil)
+
+type TransformCommand struct {
+	*BaseCommand
+}
+
+func (c *TransformCommand) Synopsis() string {
+	return "Interact with Vault's Transform Secrets Engine"
+}
+
+func (c *TransformCommand) Help() string {
+	helpText := `
+Usage: vault transform <subcommand> [options] [args]
+
+  This command has subcommands for interacting with Vault's Transform Secrets
+  Engine. Here are some simple examples, and more detailed examples are
+  available in the subcommands or the documentation.
+
+  To import a key into a new FPE transformation:
+
+  $ vault transform import transform/transformations/fpe/new-transformation @path/to/key \
+      template=identifier \
+	  allowed_roles=physical-access 
+
+  Please see the individual subcommand help for detailed usage information.
+`
+
+	return strings.TrimSpace(helpText)
+}
+
+func (c *TransformCommand) Run(args []string) int {
+	return cli.RunResultHelp
+}