ff 0.13 (#269)

* Partial move to ff 0.13

It turns out the newly released k256 0.12 isn't on ff 0.13, preventing further
work at this time.

* Update all crates to work on ff 0.13

The provided curves still need to be expanded to fit the new API.

* Finish adding dalek-ff-group ff 0.13 constants

* Correct FieldElement::product definition

Also stops exporting macros.

* Test most new parts of ff 0.13

* Additionally test ff-group-tests with BLS12-381 and the pasta curves

We only tested curves from RustCrypto. Now we test a curve offered by zk-crypto,
the group behind ff/group, and the pasta curves, which is by Zcash (though
Zcash developers are also behind zk-crypto).

* Finish Ed448

Fully specifies all constants, passes all tests in ff-group-tests, and finishes moving to ff-0.13.

* Add RustCrypto/elliptic-curves to allowed git repos

Needed due to k256/p256 incorrectly defining product.

* Finish writing ff 0.13 tests

* Add additional comments to dalek

* Further comments

* Update ethereum-serai to ff 0.13

crypto/ff-group-tests/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ff-group-tests"
-version = "0.12.2"
+version = "0.13.0"
 description = "A collection of sanity tests for implementors of ff/group APIs"
 license = "MIT"
 repository = "https://github.com/serai-dex/serai/tree/develop/crypto/ff-group-tests"
@@ -14,8 +14,15 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 rand_core = "0.6"
-group = "0.12"
+
+subtle = "^2.4"
+
+group = "0.13"
 
 [dev-dependencies]
-k256 = { version = "0.12", features = ["bits"] }
-p256 = { version = "0.12", features = ["bits"] }
+k256 = { version = "0.13", features = ["bits"] }
+p256 = { version = "0.13", features = ["bits"] }
+
+bls12_381 = "0.8"
+
+pasta_curves = "0.5"