Provide a Log4j appender for resource logging

LoggerProxy provides logging capability. However, some libraries especially [AWS SDK uses Log4j](https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/java-dg-logging.html) for their logging.

To enable log4j for resource handler, a Log4j appender should be provided so it can be hooked with Log4j and upload logs to resource provider's CW logs.

Start by locating LoggerProxy and reviewing how the resource handler currently uploads logs to the resource provider's CloudWatch logs. Then investigate the AWS SDK's Log4j integration and define what a Log4j appender must provide; done means Log4j-based libraries can route their resource-handler logs through that path.

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