Add dependencies for kafka and rabbit behind features

Cargo.toml

@@ -28,6 +28,8 @@ members = [
 
 [features]
 postgres = ["sqlx/postgres"]
+kafka = ["rdkafka"]
+rabbit = ["lapin"]
 
 [dependencies]
 # Serialization/Deserialization
@@ -45,6 +47,11 @@ ouroboros = "0.15"
 
 # Sql library for async impl
 sqlx = { version = "0.6.1", features = ["runtime-tokio-native-tls", "uuid", "json", "chrono"], optional = true }
+# Kafka library
+rdkafka = { version = "0.29.*", features = ["ssl-vendored"], optional = true }
+# Rabbit library
+lapin = { version = "2.1.1", optional = true }
+
 # To stream over sqlx results
 futures = "0.3"
 tracing = "0.1"