perf: optimize point tripling

[gbotrel]

Description

Optimize G1Jac tripling (20% faster for bn254, 10% for bls12-377).

benchmark                   old ns/op     new ns/op     delta
BenchmarkG1JacTriple-32     290           233           -19.49%
BenchmarkG2JacTriple-32     546           542           -0.73%

[Copilot]

Pull Request Overview

This PR optimizes the point tripling operation for G1 and G2 Jacobian coordinates in elliptic curve cryptography, achieving 20% faster performance for bn254 and 10% for bls12-377 curves.

• Refactors the Triple method implementation with clearer step-by-step structure and improved documentation
• Adds comprehensive test coverage for the Triple method including correctness tests against double+add and benchmarking
• Implements optimized helper functions for multiplication by 3 and 4, leveraging specialized fp.MulBy3 where available

Reviewed Changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated no comments.

File	Description
internal/generator/ecc/template/point.go.tmpl	Template optimization with step-by-step algorithm and conditional MulBy3 usage
internal/generator/ecc/template/tests/point.go.tmpl	Template for Triple test functions and benchmarks
Multiple ecc/*/g1.go and g2.go files	Generated optimized Triple implementations across all curve types
Multiple ecc/*/g1_test.go and g2_test.go files	Generated test coverage for Triple method validation

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