build: introduce the fhevm-engine-common crate

Used to share code between the coprocessor crate and the executor crate.
The executor crate will be used for the fhEVM-native implementation.

fhevm-engine/Cargo.toml

@@ -1,32 +1,7 @@
-[package]
-name = "fhevm-engine"
-version = "0.1.0"
-edition = "2021"
+[workspace]
+resolver = "2"
+members = ["coprocessor", "executor", "fhevm-engine-common"]
 
-[dependencies]
-# Common dependencies
-tokio = { version = "1.0", features = ["rt-multi-thread", "macros"] }
-prost = "0.13"
-tonic = { version = "0.12", features = ["server"] }
-# Optional dependencies
-tonic-web = "0.12"
-tonic-health = "0.12"
-tonic-types = "0.12"
-tokio-util = "0.7"
+[workspace.dependencies]
 tfhe = { version = "0.8.0-alpha.2", features = ["boolean", "shortint", "integer", "aarch64-unix"] }
-sqlx = { version = "0.7", features = ["runtime-tokio", "tls-rustls", "postgres", "uuid"] }
-serde_json = "1.0"
-regex = "1.10.5"
-lazy_static = "1.5.0"
 clap = { version = "4.5", features = ["derive"] }
-lru = "0.12.3"
-bincode = "1.3.3"
-hex = "0.4"
-strum = { version = "0.26", features = ["derive"] }
-bigdecimal = "0.4"
-
-[dev-dependencies]
-testcontainers = "0.21"
-
-[build-dependencies]
-tonic-build = "0.12"

fhevm-engine/coprocessor/.gitignore

@@ -0,0 +1 @@
+target