Karatsuba algorithm for multiplication #628
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Description
For the detail of the algorithms check this paper.
The PR does not include Karatsuba algorithm for CM31. When tested it did not improve the benchmarks. Possibly due to the already efficient algorithms for multiplication in M31.
Here's the performance improvement report:
This change is![Reviewable](https://camo.githubusercontent.com/23b05f5fb48215c989e92cc44cf6512512d083132bd3daf689867c8d9d386888/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)