Autodp

Bug fixes, more transformers, more calibrators, support for more RDP mechanisms. It also fixes the issues of the current pip install version.

A few changes that improves the usability and coverage of autodp:

1. Some additions to the autodp_core.Mechanism class so as to support easier implementation of a class using autodp mechanism API. See the example: https://github.com/yuxiangw/autodp/blob/3d28a057d042b51ef69d00a73f46f0db2b44066a/example/example_calibrator.py#L67
2. Adding some classical mechanisms to the mechanism zoo, including the improved analysis for the exponential mechanism by Durfee and Rogers.

1. Object oriented design: see check out autodp_core.py
2. Zoos are open with many private animals: mechanism_zoo, transformer_zoo, calibrator_zoo.
3. Added support for f-DP and privacy profile alongside RDP.
4. Stronger RDP to (eps,delta)-DP conversion.
5. Privacy amplification by X.
6. Exactly tight privacy accounting for Gaussian mechanisms and their compositions.
7. Interpretable privacy guarantee via Hypothesis testing interpretation for any Mechanism.

- Collecting the fixes of a few bugs that break the code in corner cases.
- Adding more tutorials.
- Adding more support in autodp.rdp_bank

Basic functionalities are ready to use.