feat(bin): Introduce Kona ExEx Binary (#1)

**Description**

Introduces a stub entrypoint for the kona execution extension.

Cargo.toml

@@ -9,8 +9,8 @@ keywords = ["ethereum", "crypto"]
 categories = ["cryptography", "cryptography::cryptocurrencies"]
 
 [workspace]
-members = []
-default-members = []
+members = ["bin/kona-exex"]
+default-members = ["bin/kona-exex"]
 
 # Explicitly set the resolver to version 2, which is the default for packages with edition >= 2021
 # https://doc.rust-lang.org/edition-guide/rust-2021/default-cargo-resolver.html
@@ -142,3 +142,4 @@ reth-tracing = { git = "https://github.com/paradigmxyz/reth", version = "1.0.5"
 
 # misc
 tracing = "0.1.0"
+eyre = "0.6.12"

bin/kona-exex/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "kona-exex"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+keywords.workspace = true
+categories.workspace = true
+
+[dependencies]
+# Workspace
+eyre.workspace = true
+tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
+tracing.workspace = true

bin/kona-exex/src/main.rs

@@ -0,0 +1,7 @@
+use eyre::Result;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    println!("Hello, kona!");
+    Ok(())
+}