moved attachments and campaingn to others

src/others/attachment.rs

@@ -0,0 +1,10 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "PascalCase")]
+pub struct AttachmentInfo {
+    pub id: String,
+    pub name: String,
+    pub r#type: String,
+    pub size: u64,
+}