fix: add no-op transaction methods for non-transactional databases

Author: datlechin

Plugins/ClickHouseDriverPlugin/ClickHousePlugin.swift

@@ -64,6 +64,9 @@ final class ClickHousePluginDriver: PluginDatabaseDriver, @unchecked Sendable {
     var serverVersion: String? { _serverVersion }
     var supportsSchemas: Bool { false }
     var supportsTransactions: Bool { false }
+    func beginTransaction() async throws {}
+    func commitTransaction() async throws {}
+    func rollbackTransaction() async throws {}
     var currentSchema: String? { nil }
 
     init(config: DriverConnectionConfig) {

Plugins/MongoDBDriverPlugin/MongoDBPluginDriver.swift

@@ -19,6 +19,9 @@ final class MongoDBPluginDriver: PluginDatabaseDriver {
     var serverVersion: String? { mongoConnection?.serverVersion() }
     var currentSchema: String? { nil }
     var supportsTransactions: Bool { false }
+    func beginTransaction() async throws {}
+    func commitTransaction() async throws {}
+    func rollbackTransaction() async throws {}
 
     init(config: DriverConnectionConfig) {
         self.config = config

Plugins/OracleDriverPlugin/OraclePlugin.swift

@@ -86,14 +86,6 @@ final class OraclePluginDriver: PluginDatabaseDriver, @unchecked Sendable {
         // Oracle uses implicit transactions — no explicit BEGIN needed
     }
 
-    func commitTransaction() async throws {
-        _ = try await execute(query: "COMMIT")
-    }
-
-    func rollbackTransaction() async throws {
-        _ = try await execute(query: "ROLLBACK")
-    }
-
     // MARK: - Query Execution
 
     func execute(query: String) async throws -> PluginQueryResult {