Add Key field to CustomCommandPrompt struct

Add Form field to CustomCommandObjects struct

Write user prompts responses to Form field

Ensure that map keys exists

Add form prompts integration test

Remove redundant index

pkg/config/user_config.go

@@ -314,6 +314,8 @@ type CustomCommand struct {
 }
 
 type CustomCommandPrompt struct {
+	Key string `yaml:"key"`
+
 	// one of 'input', 'menu', 'confirm', or 'menuFromCommand'
 	Type string `yaml:"type"`