Drop OKX solver (#204)

The OKX solver was migrated to another repo
cowprotocol/services#4236. This PR cleans up the
current repository.

Author: squadgazzz

Cargo.lock

@@ -18,18 +18,14 @@ anyhow = "1"
 alloy = { version = "1.1.0", default-features = false, features = ["rand"] }
 async-trait = "0.1.80"
 axum = "0.6"
-base64 = "0.22.1"
 bigdecimal = { version = "0.3", features = ["serde"] }
 chrono = { version = "0.4.38", features = ["serde"], default-features = false }
 clap = { version = "4", features = ["derive", "env"] }
 futures = "0.3.30"
 hex = "0.4"
-hmac = "0.12.1"
-humantime = "2.1.0"
 humantime-serde = "1.1.1"
 hyper = "0.14"
 itertools = "0.11"
-moka = { version = "0.12", features = ["future"] }
 num = "0.4"
 prometheus = "0.13"
 prometheus-metric-storage = "0.5.0"
@@ -38,15 +34,12 @@ serde = "1"
 serde_json = "1"
 serde_with = "3"
 serde_repr = "0.1"
-sha2 = "0.10.8"
 thiserror = "1"
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "signal", "time"] }
 toml = "0.7"
 tower = "0.4"
 tower-http = { version = "0.4", features = ["trace"] }
 tracing = "0.1"
-web3 = "0.19"
-
 contracts = { git = "https://github.com/cowprotocol/services.git", tag = "v2.345.4", package = "contracts" }
 ethrpc = { git = "https://github.com/cowprotocol/services.git", tag = "v2.345.4", package = "ethrpc" }
 observe = { git = "https://github.com/cowprotocol/services.git", tag = "v2.345.4", package = "observe" , features = ["axum-tracing"]}

Cargo.toml

@@ -47,12 +47,6 @@ impl Slippage {
         Self(value)
     }
 
-    /// Returns 1% slippage.
-    #[cfg(test)]
-    pub fn one_percent() -> Self {
-        Self::new("0.01".parse().unwrap())
-    }
-
     /// Returns a zero slippage.
     pub fn zero() -> Self {
         Self::new(BigDecimal::zero())