Add Type Definition for orderBy with Raw Expression Issue 5711

[redaxle]

This change adds the Raw type when used as a column definition in orderBy in order to satisfy the type checks. Typescript will currently indicate that there's no overload for any of the following:

knex('foo').orderBy(knex.raw('count(*)'), 'desc');

knex('foo').orderBy([{ column: knex.raw('count(*)') }]);

Use of a Raw result for the column will no longer result in a type error.