added support for unsigned types in mysql, singlestore; added tests f…

[OleksiiKH0240]

Added support for unsigned types in MySQL and SingleStore.
With the following schema:

import { int, mysqlTable } from 'drizzle-orm/mysql-core';

export const allDataTypes = mysqlTable('all_data_types', {
	intUnsigned: int('integer_unsigned', { unsigned: true })
});

You can use a basic seeding script, and it will work correctly:

await seed(db, schema, { count: 10000 });