move signal-gateway binary to its own crate, simplify deps

Cargo.toml

@@ -3,6 +3,7 @@ resolver = "2"
 members = [
     "prometheus-http-client",
     "signal-gateway",
+    "signal-gateway-bin",
 ]
 
 [workspace.package]
@@ -24,7 +25,6 @@ result_large_err = "allow"
 prometheus-http-client = { path = "prometheus-http-client", default-features = false }
 
 async-trait = "0.1"
-bytes = "1"
 chrono = { version = "0.4", default-features = false, features = ["clock", "serde", "std"] }
 chrono-tz = "0.10"
 conf = "0.4"
@@ -46,7 +46,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 syslog_rfc5424 = "0.10"
 thiserror = "2"
-tokio = { version = "1", features = ["io-util", "macros", "net", "rt-multi-thread", "signal", "sync", "time"] }
+tokio = { version = "1", features = ["io-util", "macros", "net", "sync", "time"] }
 tokio-util = { version = "0.7", features = ["codec"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }