FedBN, FedPer, MOON, PerFCL and bug fixes

What's Changed

• Updating README by @emersodb in #51
• Dbe/implement unweighted fedavg by @emersodb in #52
• Add functionality to support FedBN method by @emersodb in #53
• Adding in a citation line at the bottom. by @emersodb in #57
• Refactor of Losses default additional_losses to empty by @emersodb in #58
• Fixing a bug with the FedProx refactor in FLamby by @emersodb in #59
• Small fix to the find_best_hp.py script by @emersodb in #60
• Refactor setup client by @jewelltaylor in #54
• Machinery to support Federated Evaluation Only by @emersodb in #55
• Add Server-side Checkpointing to Server Base by @emersodb in #56
• Fix wandb by @jewelltaylor in #61
• Dbe/setting doc string format by @emersodb in #64
• Update apfl client by @jewelltaylor in #62
• Moon by @sanaAyrml in #66
• Add contrastive losses by @sanaAyrml in #67
• Feature alignment by @yc7z in #63
• Create Fixed Requirements File for FLamby, Update Dynamic Weight Exchanger and FedOpt Example by @emersodb in #68
• Metric refactor by @jewelltaylor in #69
• Checkpoint Ablation for Flamby by @emersodb in #71
• FedPer Implementation by @emersodb in #72

Full Changelog: v0.1.7...v0.1.8