2.5.0rc4: Feature enhancements

What's Changed

• Update xgboost example and ci by @YuanTingHsieh in #2794
• [2.5] Update flower CLI by @yanchengnv in #2792
• Fix FedBN api key issue by replacing comet by @ZiyueXu77 in #2798
• more app_opt scan example changes by @yhwen in #2797
• Add first version of release notes by @nvkevlu in #2800
• FIX hard-coded sp_end_point in POC by @chesterxgchen in #2795
• Add hello examples with new APIs by @nvkevlu in #2785
• Update autofedrl example by @ZiyueXu77 in #2801
• Refactor XGBDataLoader by @YuanTingHsieh in #2804
• Fix HE docstring typo by @YuanTingHsieh in #2802
• re-arrange getting started examples by @chesterxgchen in #2805
• Update secure xgboost examples by @YuanTingHsieh in #2803
• XGBoost user interface change and XGBoost version check by @nvidianz in #2808
• Add lock to reliable message by @nvidianz in #2811
• Fixed 2 PTFileModelLocator config errors (Research) by @yhwen in #2807
• Update xgboost example by @YuanTingHsieh in #2813
• Refactor Job API by @SYangster in #2799
• Add CUDA plugin code by @YuanTingHsieh in #2814
• Fix Jenkins CI by @YuanTingHsieh in #2812
• Remove the module class scan by @yhwen in #2790
• Change all name to path by @YuanTingHsieh in #2817
• Add back hello-numpy-sag and update references by @nvkevlu in #2816
• Revert "Remove the module class scan " by @yhwen in #2819
• Fix config typos by @YuanTingHsieh in #2818
• Relax grpcio/protobuf versions by @nvidianz in #2822
• ScriptExecutor improvements by @SYangster in #2820
• Fix Job API Examples by @SYangster in #2823

Full Changelog: 2.5.0rc3...2.5.0rc4