ethereum: implement schnorr verification contract deployment and related crypto (#36)

* basic schnorr verify working

* add schnorr-verify as submodule

* remove previous code

* Misc Ethereum work which will probably be disregarded

* add ecrecover hack test, worksgit add src/

* merge w develop

* starting w/ rust-web3

* trying to use ethers

* deploy_schnorr_verifier_contract finally working

* modify EthereumHram to use 27/28 for point parity

* updated address calc, solidity schnorr verify now working

* add verify failure to test

* update readme

* move ethereum/ to coins/

* un fmt coins/monero

* update .gitmodules

* fix cargo paths

* fix coins/monero

* add #[allow(non_snake_case)]

* un-fmt stuff

* move crypto to coins/ethereum

* move unit tests to ethereum/tests

* remove js, build w ethers

* update .gitignore

* address comments

* add q != 0 check

* update contract param order

* update contract license to AGPL

* update ethereum-serai license to GPL and fmt

* GPLv3 for ethereum-serai

* AGPLv3 for ethereum-serai

* actually fix license

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

coins/ethereum/README.md

@@ -0,0 +1,21 @@
+# Ethereum
+
+This package contains Ethereum-related functionality, specifically deploying and interacting with Serai contracts.
+
+## Requirements
+
+- anvil & solc & geth's abigen (see [here](https://github.com/gakonst/ethers-rs#running-the-tests))
+
+## To test 
+
+To compile contracts:
+```
+cargo build
+```
+
+This places the compiled artifact into `artifacts/`.
+
+To run Rust tests (you must have compiled the contracts first):
+```
+cargo test
+```