Optimized differential privacy implementation

[ahzero7d1]

1. Gaussian noise calibration implementation

   • Added Gaussian noise calibration for differential privacy (DP) based on privacy budget (epsilon), failure possibility (delta) and weight clipping radius

2. Adaptive clipping mechanism

   • Implemented adaptive clipping radius using historical moving average of weight updates

3. cli testing tool modification

4. Webapp interface updates

   • Added UI fields for the new DP parameters

[tharvik]

thanks for the great work! I added a few comments on how to improve parts of it but the core feature is there 🎉

btw, I don't remember if we talked about adding a test for the feature. for an integration test, you can add one in server/tests/e2e/federated.spec.ts trying out the feature and if you have some hardening/units tests in mind, you can also some in discojs/src/privacy.spec.ts to ensure that it works in many conditions.

[tharvik]

updated it a bit with the latest changes for byzantine impl, thanks for the huge contributions!