bls: impl G1 generator & fix G2 generator

[petscheit]

While implementing the G1 generator, I discovered that the G2 generator was set without doing cofactor multiplication. To match the BLS12-381 specs, I have updated the G2 generator and implemented the G1 generator.

Pull Request type

• [x] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Build-related changes
• [ ] Documentation content changes
• [ ] Testing
• [ ] Other (please describe):

What is the current behavior?

The G2 generator point was missing the cofactor multiplication, resulting in a different point being used.

What is the new behavior?

I have updated the G2 generator to match the specs described here

Does this introduce a breaking change?

• [ ] Yes
• [x] No

[feltroidprime]

good