Switch to homogeneous coordinates + Add complete formulae (#19)

* Use homogenous coordinates

- Pasta curves adapted to use homogenous instead of
jacobian coordinates.
- Efficient complete formulas for add and dbl.

* Improve Homogeneous to Jacobian

Co-authored-by: Han <tinghan0110@gmail.com>

* Improve Jacobian to homogeneous

Co-authored-by: Han <tinghan0110@gmail.com>

* Remove leftover

* Fix homogeneous coordinates for inf

* Add static 3b

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Co-authored-by: Han <tinghan0110@gmail.com>

Cargo.toml

@@ -30,7 +30,7 @@ pasta_curves = "0.4.0"
 static_assertions = "1.1.0"
 rand = "0.8"
 rand_core = { version = "0.6", default-features = false }
-lazy_static = { version = "1.4.0"}
+lazy_static = "1.4.0"
 num-bigint = "0.4.3"
 num-traits = "0.2"
 paste = "1.0.11"