[code] restructured into different crates

crates/lanspread-server/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "lanspread-server"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+# local
+lanspread-db = { path = "../lanspread-db" }
+# external
+bytes = { workspace = true }
+eyre = { workspace = true }
+itertools = { workspace = true }
+s2n-quic = { workspace = true }
+serde_json = { workspace = true }
+semver = { workspace = true }
+tokio = { workspace = true }