Add config:debug command

* Add ConfigDebugCommand Class
* Register config:debug command	
* Add execute method code	
* Use table helper for output	
* Extract config list to method getAllConfigurations	
* Import InputArgument class	
* Add config-name argument	
* Read config-name argument	
* Add getConfigurationByName method	
* Call getConfigurationByName if config_name entered
* Update docblocks
* Import Drupal\Component\Serialization\Yaml class
* Use Yaml::encode to process read configuration