refactor(engineio): move shareable constructs with future client to core

crates/engineioxide-core/Cargo.toml

@@ -17,6 +17,29 @@ rand = "0.10"
 base64 = "0.22"
 serde.workspace = true
 bytes.workspace = true
+serde_json.workspace = true
+http-body.workspace = true
+http-body-util.workspace = true
+http.workspace = true
+futures-util.workspace = true
+smallvec.workspace = true
+pin-project-lite.workspace = true
+
+# Engine.io V3 payload
+itoa = { workspace = true, optional = true }
+memchr = { version = "2.7", optional = true }
+
+# Tracing
+tracing = { workspace = true, optional = true }
+
+
+[features]
+v3 = ["dep:memchr", "dep:itoa"]
+tracing = ["dep:tracing"]
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["macros", "rt", "time", "sync"] }
+tokio-stream.workspace = true
 
 [lints]
 workspace = true

crates/engineioxide-core/src/lib.rs

@@ -1,8 +1,13 @@
 #![warn(missing_docs)]
 #![doc = include_str!("../README.md")]
 
+mod packet;
+mod protocol;
 mod sid;
 mod str;
 
+pub use packet::{OpenPacket, Packet, PacketBuf, PacketParseError};
+pub use protocol::{ProtocolVersion, TransportType, UnknownTransportError};
 pub use sid::Sid;
 pub use str::Str;
+pub mod payload;