Implement genesis liquidity protocol (#545)

* add genesis liquidity implementation

* add missing deposit event

* fix CI issues

* minor fixes

* make math safer

* fix fmt

* make remove liquidity an authorized call

* implement setting initial values for coins

* add genesis liquidity test & misc fixes

* updato develop latest

* fix rotation test

* Finish merging develop

* Remove accidentally committed ETH files

* fix pr comments

* further bug fixes

* fix last pr comments

* tidy up

* Misc

---------

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

substrate/genesis-liquidity/primitives/src/lib.rs

@@ -0,0 +1,54 @@
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(feature = "std")]
+use zeroize::Zeroize;
+
+#[cfg(feature = "borsh")]
+use borsh::{BorshSerialize, BorshDeserialize};
+#[cfg(feature = "serde")]
+use serde::{Serialize, Deserialize};
+
+use sp_std::vec::Vec;
+
+use scale::{Encode, Decode, MaxEncodedLen};
+use scale_info::TypeInfo;
+
+use serai_primitives::*;
+use validator_sets_primitives::ValidatorSet;
+
+pub const INITIAL_GENESIS_LP_SHARES: u64 = 10_000;
+
+// This is the account to hold and manage the genesis liquidity.
+pub const GENESIS_LIQUIDITY_ACCOUNT: SeraiAddress = system_address(b"GenesisLiquidity-account");
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, Decode, MaxEncodedLen, TypeInfo)]
+#[cfg_attr(feature = "std", derive(Zeroize))]
+#[cfg_attr(feature = "borsh", derive(BorshSerialize, BorshDeserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub struct Values {
+  pub monero: u64,
+  pub ether: u64,
+  pub dai: u64,
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, Decode, MaxEncodedLen, TypeInfo)]
+#[cfg_attr(feature = "std", derive(Zeroize))]
+#[cfg_attr(feature = "borsh", derive(BorshSerialize, BorshDeserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub struct LiquidityAmount {
+  pub shares: u64,
+  pub coins: u64,
+}
+
+impl LiquidityAmount {
+  pub fn zero() -> Self {
+    LiquidityAmount { shares: 0, coins: 0 }
+  }
+}
+
+/// The message for the oraclize_values signature.
+pub fn oraclize_values_message(set: &ValidatorSet, values: &Values) -> Vec<u8> {
+  (b"GenesisLiquidity-oraclize_values", set, values).encode()
+}