feat: twisted edwards curves

[qalisander]

Follows #589

PR Checklist

• Tests
• Documentation
• Changelog

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[codecov]

Codecov Report

Attention: Patch coverage is 52.92553% with 177 lines in your changes missing coverage. Please review.

Project coverage is 85.1%. Comparing base (5f66d61) to head (f6a05f7).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
lib/crypto/src/curve/te/projective.rs	52.1%	78 Missing ⚠️
lib/crypto/src/curve/te/affine.rs	31.6%	69 Missing ⚠️
lib/crypto/src/curve/te/mod.rs	81.6%	18 Missing ⚠️
lib/crypto/src/field/fp.rs	22.2%	7 Missing ⚠️
lib/crypto/src/curve/sw/affine.rs	0.0%	3 Missing ⚠️
lib/crypto/src/curve/sw/mod.rs	0.0%	1 Missing ⚠️
lib/crypto/src/curve/sw/projective.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/crypto/src/curve/mod.rs	16.3% <ø> (ø)
lib/crypto/src/curve/sw/mod.rs	91.7% <0.0%> (ø)
lib/crypto/src/curve/sw/projective.rs	72.7% <0.0%> (ø)
lib/crypto/src/curve/sw/affine.rs	35.5% <0.0%> (ø)
lib/crypto/src/field/fp.rs	73.2% <22.2%> (-1.1%)	⬇️
lib/crypto/src/curve/te/mod.rs	81.6% <81.6%> (ø)
lib/crypto/src/curve/te/affine.rs	31.6% <31.6%> (ø)
lib/crypto/src/curve/te/projective.rs	52.1% <52.1%> (ø)

... and 1 file with indirect coverage changes

[0xNeshi]

Would it make sense to implement ref + ref?

[0xNeshi]

Some general comments:

• could any of the new functions be marked with inline(always) or must_use?
• some flows are not covered with unit tests
• could we implement any proptests for this?
• missing CHANGELOG

[bidzyyys]

Agree with @0xNeshi 💯

[qalisander]

Actually sw also missing some flows and proptests. Currently tests are enough just to validate implementation. But we will add much more proptests in future.
Added notion in the CHANGELOG

[bidzyyys]

Almost looks good, take care of @0xNeshi comments please.

[bidzyyys]

Agree with @0xNeshi 💯