decode timestamp without timezone as local DateTime and decode timestamp with timezone respecting the timezone defined in the connection, timeZone option in ConnectionSettings is now a TimeZoneSettings type instead of String

Author: Isaque Neves

lib/src/connectors/postgres_connector.dart

@@ -39,7 +39,7 @@ class PostgresConnector extends Connector implements ConnectorInterface {
 
     // if (config.containsKey('timezone') && config['timezone'] != null) {
     //   var timezone = config['timezone'];
-    //   await connection.execute("set time zone '$timezone'");
+    //   await connection.execute("set timezone TO '$timezone'");
     // }
 
     // Unlike MySQL, Postgres allows the concept of "schema" and a default schema

lib/src/pdo/postgres/postgres_pdo.dart

@@ -100,7 +100,7 @@ class PostgresPDO extends PDOInterface {
       await conn.execute("SET search_path TO ${dsnParser.schema}");
     }
     if (dsnParser.timezone != null) {
-      await conn.execute("SET time zone '${dsnParser.timezone}'");
+      await conn.execute("SET timezone TO '${dsnParser.timezone}'");
     }
     if (dsnParser.applicationName != null) {
       await conn

lib/src/pdo/postgres_v3/postgres_v3_pdo.dart

@@ -107,7 +107,7 @@ class PostgresV3PDO extends PDOInterface {
       await conn.execute("SET search_path TO ${dsnParser.schema}");
     }
     if (dsnParser.timezone != null) {
-      await conn.execute("SET time zone '${dsnParser.timezone}'");
+      await conn.execute("SET timezone TO '${dsnParser.timezone}'");
     }
     if (dsnParser.applicationName != null) {
       await conn