Update to Exceptions: add codes, update phpunit tests

DB Class throws Exception if on init it fails to connect to the DB,
will not throw Exception if failed connection during execution but
will do the normal retry and soft failure run
DB\ArrayIO will throw Exception on missing table array and table name

All Exceptions have a code set

4dev/tests/DB/CoreLibsDBIOTest.php

@@ -445,12 +445,14 @@ final class CoreLibsDBIOTest extends TestCase
 	{
 		// 0: connection array
 		// 1: status after connection
+		// 2: exception name
 		// 2: info string
 		// 3: ???
 		return [
 			'invalid connection' => [
 				self::$db_config['invalid'],
 				false,
+				'RuntimeException',
 				"-DB-info-> Connected to db '' with schema 'public' as user "
 					. "'' at host '' on port '5432' with ssl mode 'allow' **** "
 					. "-DB-info-> DB IO Class debug output: Yes **** ",
@@ -459,6 +461,7 @@ final class CoreLibsDBIOTest extends TestCase
 			'valid connection' => [
 				self::$db_config['valid'],
 				true,
+				'',
 				"-DB-info-> Connected to db 'corelibs_db_io_test' with "
 					. "schema 'public' as user 'corelibs_db_io_test' at host "
 					. "'localhost' on port '5432' with ssl mode 'allow' **** "
@@ -475,13 +478,21 @@ final class CoreLibsDBIOTest extends TestCase
 	 * @dataProvider connectionProvider
 	 * @testdox Connection will be $expected [$_dataName]
 	 *
+	 * @param  array  $connection
+	 * @param  bool   $expected_status
+	 * @param  string   $exception
+	 * @param  string $expected_string
 	 * @return void
 	 */
 	public function testConnection(
 		array $connection,
 		bool $expected_status,
+		string $exception,
 		string $expected_string
 	): void {
+		if ($expected_status === false) {
+			$this->expectException($exception);
+		}
 		$db = new \CoreLibs\DB\IO(
 			$connection,
 			self::$log