Decouple core Yaak logic from Tauri (#354)

crates/yaak-sse/src/lib.rs

@@ -0,0 +1 @@
+pub mod sse;

crates/yaak-sse/src/sse.rs

@@ -0,0 +1,12 @@
+use serde::{Deserialize, Serialize};
+use ts_rs::TS;
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default, TS)]
+#[serde(default, rename_all = "camelCase")]
+#[ts(export, export_to = "sse.ts")]
+pub struct ServerSentEvent {
+    pub event_type: String,
+    pub data: String,
+    pub id: Option<String>,
+    pub retry: Option<u64>,
+}