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.

CMakeLists.txt

@@ -106,7 +106,7 @@ include(ConfigInstall)
 CU_RUN_HOOK("AFTER_LOAD_CMAKE_MODULES")
 
 find_package(PCHSupport)
-find_package(MySQL REQUIRED)
+find_package(MySQL REQUIRED COMPONENTS lib)
 
 if(UNIX AND WITH_PERFTOOLS)
     find_package(Gperftools)