laminas-servicemanager Created tool to inject factory maps into configuration

This patch adds a new tool, create-factory-map, which will map a given class to a given factory in the specified configuration file, under the provided configuration key (defaulting to service_manager).

Usage:

  ./vendor/zendframework/zend-servicemanager/bin/create-factory-map [-h|--help|help] <configFile> <className> <factoryName> [<key>]

Arguments:

  -h|--help|help    This usage message
  <configFile>      Path to an config file in which to map the factory.
                    If the file does not exist, it will be created. If
                    it does exist, it must return an array.
  <className>       Name of the class to map to a factory.
  <factoryName>     Name of the factory class to use with <className>.
  [<key>]           (Optional) The top-level configuration key under which
                    the factory map should appear; defaults to
                    "service_manager".

As part of this work, I moved the methods for dumping configuration files into a trait; this trait is now composed by both the ConfigDumper and FactoryMapperCommand.

Originally posted by @weierophinney at https://github.com/zendframework/zend-servicemanager/pull/161