Bootstrap geth Rust workspace

crates/geth-pubsub/src/lib.rs

@@ -0,0 +1,14 @@
+use geth_types::{ResourceId, TopicId};
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct PubsubTopic {
+    pub id: TopicId,
+    pub resource: ResourceId,
+    pub name: String,
+}
+
+#[must_use]
+pub fn pubsub_storage_warning() -> &'static str {
+    "pubsub is lossy notification transport, not authoritative storage"
+}