feat: V1.0 (#734)

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crates/mcp-core/src/role.rs

@@ -0,0 +1,9 @@
+/// Roles to describe the origin/ownership of content
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Role {
+    User,
+    Assistant,
+}