πΎβ exponentiation, with endomorphism acceleration #429
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This PR adds a performance baseline for Whisk in GT.
https://ethresear.ch/t/the-return-of-torus-based-cryptography-whisk-and-curdleproof-in-the-target-group/16678
Here is the speed on a 7840U:
For comparison here is scalar mul on G1
![image](https://private-user-images.githubusercontent.com/22738317/348573822-a4440d24-bc69-4797-a837-5ec1e8bf9bc9.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.lt56ZB-EEFp94yeSK_IoqEeoFroHjGYSlt8RAvJKtwk)
and on G2
![image](https://private-user-images.githubusercontent.com/22738317/348573843-3c1c063e-2c8c-4a76-9870-6fb24570fd8f.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.-RGaagywgItAoBs0kQPuZdy8k-bo_LIxY-J55mRFMck)
Hence exponentiation in Gt (131 us) is within 30% of scalar mul in G2 (96 us).
cc @asanso