Provide APIs for writing to user logs for publication to CloudWatch

[jennakwon06]

Describe your feature request

Currently, Amazon-Ray AMI allows for logs written to /tmp/ray/user/ locations to become auto published to CloudWatch. This means that users of Amazon-Ray AMI could potentially end up with duplicate code in configuring Python loggers to write to this location. The goal of this feature request is to provide Python APIs for users so that they do not have to write the logger-configuration logic and just call logger = configure_application_logger(logging.getLogger())

[jennakwon06]

assigning to myself @jennakwon06