Spu

- [Feature] Add python simulation module.
- [Feature] Support general sort comparator.
- [Feature] Support remainder operation.
- [Feature] Support arithmetic right shift operation.
- [API] Change DataType definition, support more accurate encoding.

- [bugfix] Fixed several macOS build issues.

20220412

- [API] Add storage_type/data_type, remove type_data.
- [Experimental] Log(natural logarithm) is calculated with Pade approximation
instead of Householder's approximation.
- [API] Fix typo, goldschmdit.
- [Improvement] fxp div, improvement accuracy with normal distributed inputs.

20220325

- [Bugfix] Fix SEMI2K division wrong answer

20220324

- [Improvement] Lift Convolution limitations.
- [Improvement] Optimize maximum/minimum speed, with MPC B2A single bit conversion.
- [Experimental] Div is calculated with direct goldschmdit method instead of
multiplication of dividend and divisor reciprocal.
- [API] change RuntimeConfig.enable_op_time_profile to enable_pphlo_profile.
- [API] change RuntimeConfig.fxp_reciprocal_goldschmdit_iters to fxp_div_goldschmdit_iters.

20220308

- [Feature] add silent ot support for various ot scenarios (chosen/correlated/random
messages, chosen/correlated/random choices, 1o2/1oN)
- [Feature] add non-linear computation protocols based on silent ot (comparison,
truncation, b2a, triple, randbit, etc)
- [Feature] add a 2PC protocol: Cheetah
- [Improvement] concatenate is a lot faster
- [API] add RuntimeConfig.enable_op_time_profile to ask SPU to collect timing profiling data
- [Bugfix] fixed pphlo.ConstOp may lose signed bit after encoding

20220303