ContainerBalancerConfig doesn't read config from ozone-site.xml

Issue happens when we try to update the config of "hdds.container.balancer.utilization.threshold", but the value from the SCM log said it's always the "0.1", which is the default value.

After checking the code, the construction of ContainerBalancerConfiguration doesn't comply with the pattern of "ConfigGroup", this ticket is to fix the issue to update the configuration from config file.

Since the class needs to hold OzoneConfiguration for configuration check, the method of "initialize" is created for this requirement.