added schema builder 🔥🚀✨

Added practically everything I wanted to have in except for updating
columns.
Needed to name the schema namespace as Orm::SchemaNs to avoid collision
with the Orm::Schema class.

 - unit tests with great coverage
 - new schema constants
 - a new prefix_indexes and engine DB conncetion configurations

Others:

 - IsModel tag
 - enhanced columnize in the BaseGrammar
 - used a new columnize logic in all grammars
 - new constants
 - new container utils class for joining containers
 - new DB::driver() getter for QSqlDriver
 - avoid possible crash in tests with pretend, added empty log checks
 - clang tidy, excluded to word from short variable names

include/orm/tiny/tinybuilder.hpp

@@ -906,7 +906,7 @@ namespace Orm::Tiny
 //    template<typename ...Args>
 //    Builder<Model> &
 //    Builder<Model>::callScope(
-//            const std::function<void (Builder &, Args ...)> &scope,
+//            const std::function<void(Builder &, Args ...)> &scope,
 //            Args &&...parameters)
 //    {
 //        std::invoke(scope, *this, std::forward<Args>(parameters)...);