The following changes are introduced:

• Renaming aviary to rayllm.
• Support for reading models from gcs in addition to aws s3.
• Increased testing for prompting.
• New model configs for Falcon 7B and 40B.
• Make frontend compatible with Ray Serve 2.7

Thanks for contributions from: @avnishn @csivanich @shrekris-anyscale @sihanwang41 @richardliaw @Yard1