Refactor appservices, pusher, timeline, transactionids, users

src/service/transaction_ids/data.rs

@@ -0,0 +1,16 @@
+pub trait Data {
+    pub fn add_txnid(
+        &self,
+        user_id: &UserId,
+        device_id: Option<&DeviceId>,
+        txn_id: &TransactionId,
+        data: &[u8],
+    ) -> Result<()>;
+
+    pub fn existing_txnid(
+        &self,
+        user_id: &UserId,
+        device_id: Option<&DeviceId>,
+        txn_id: &TransactionId,
+    ) -> Result<Option<Vec<u8>>>;
+}