chore: specify external types for each crate (#496)

actix-tracing/Cargo.toml

@@ -12,6 +12,14 @@ license = "MIT OR Apache-2.0"
 edition.workspace = true
 rust-version.workspace = true
 
+[package.metadata.cargo_check_external_types]
+allowed_external_types = [
+    "actix_service::*",
+    "actix_utils::*",
+    "tracing::*",
+    "tracing_futures::*",
+]
+
 [dependencies]
 actix-service = "2"
 actix-utils = "3"