Added refreshSchema to SqliteConnection, making it accessible in transactions.

Author: Chriztiaan

packages/sqlite_async/lib/src/sqlite_connection.dart

@@ -130,6 +130,8 @@ abstract class SqliteConnection extends SqliteWriteContext {
 
   Future<void> close();
 
+  Future<void> refreshSchema();
+
   /// Returns true if the connection is closed
   @override
   bool get closed;

packages/sqlite_async/lib/src/sqlite_queries.dart

@@ -140,6 +140,7 @@ mixin SqliteQueries implements SqliteWriteContext, SqliteConnection {
 
   /// Ensures that all connections are aware of the latest schema changes applied (if any).
   /// Queries and watch calls can potentially use outdated schema information after a schema update.
+  @override
   Future<void> refreshSchema() {
     return get("PRAGMA table_info('sqlite_master')");
   }