Skeleton primitives and interface crate (#13)

* wip interface primitives

* wip

* Integrate it inside rpc- crates

* fmt

* move tx to mod.rs

* Add interfaces, executor to toml

* Added nits, comments fix

crates/interfaces/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "reth-interfaces"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/foundry-rs/reth"
+readme = "README.md"
+
+[dependencies]
+reth-primitives = { path = "../primitives" }
+async-trait = "0.1.57"
+thiserror = "1.0.37"

crates/interfaces/src/executor.rs

@@ -0,0 +1,20 @@
+use async_trait::async_trait;
+use reth_primitives::Block;
+use thiserror::Error;
+
+/// Takes block and executes it, returns error
+#[async_trait]
+pub trait BlockExecutor {
+    /// Execute block
+    async fn execute(&self, _block: Block) -> Error {
+        Error::VerificationFailed
+    }
+}
+
+/// BlockExecutor Errors
+#[derive(Error, Debug, Clone)]
+pub enum Error {
+    /// Example of error
+    #[error("Example of error.")]
+    VerificationFailed,
+}

crates/interfaces/src/lib.rs

@@ -0,0 +1,11 @@
+#![warn(missing_debug_implementations, missing_docs, unreachable_pub)]
+#![deny(unused_must_use, rust_2018_idioms)]
+#![doc(test(
+    no_crate_inject,
+    attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables))
+))]
+
+//! Reth interface bindings
+
+/// Block Execution traits.
+pub mod executor;