fix(db): MariaDB 10.6+ server and connector compatibility

- Parse real MariaDB version after MySQL 5.5.5 compatibility prefix for
  DatabaseIncompatibleVersion checks.
- Relax client checks when building against MariaDB C connector
  (MARIADB_VERSION_ID); keep Oracle MySQL 8.0+ rules otherwise.
- Use mysql_stmt_bind_param on MariaDB; mysql_stmt_bind_named_param only for
  MySQL 8.3+ without MariaDB headers.
- SSL: MYSQL_OPT_SSL_ENFORCE on MariaDB connector, MYSQL_OPT_SSL_MODE elsewhere.
- Track custom_script_loader.cpp so static script link succeeds; CMake
  find_package(MySQL) requires COMPONENTS lib on CMake 3.16.

src/server/scripts/Custom/custom_script_loader.cpp

@@ -0,0 +1,26 @@
+/*
+ * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// This is where scripts' loading functions should be declared:
+// void MyExampleScript()
+
+// The name of this function should match:
+// void Add${NameOfDirectory}Scripts()
+void AddCustomScripts()
+{
+    // MyExampleScript()
+}