feat(rpc): add rpc crates

crates/rpc-types/Cargo.toml

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+[package]
+name = "reth-rpc-types"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/foundry-rs/reth"
+readme = "README.md"
+description = """
+Reth RPC types
+"""
+[dependencies]
+# reth
+reth-primitives = { path = "../primitives" }
+
+# misc
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+thiserror = "1.0"

crates/rpc-types/src/eth/mod.rs

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+//! Ethereum related types

crates/rpc-types/src/lib.rs

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+#![warn(missing_debug_implementations, missing_docs, unreachable_pub, unused_crate_dependencies)]
+#![deny(unused_must_use, rust_2018_idioms)]
+#![doc(test(
+    no_crate_inject,
+    attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables))
+))]
+
+//! Reth RPC type definitions
+//!
+//! Provides all relevant types for the various RPC endpoints, grouped by namespace.
+
+mod eth;