mysql: timestamp datetype.

[walkingdevel]

Fixes #18234

struct Test {
	id int [primary; serial]
	time1 time.Time
	time2 time.Time [sql_type: 'timestamp']
}

fn main() {
	mut db := mysql.connect(...)!

	test := Test{
		time1: time.now()
		time2: time.now()
	}

	sql db {
		create table Test
	}!

	sql db {
		insert test into Test
	}!

	tests := sql db {
		select from Test
	}!

	println(tests)

	// [Test{
	//    id: 0
	//    time1: 2023-06-28 18:00:51
	//    time2: 2023-06-28 18:00:51
	//}]
}

🤖 Generated by Copilot at d56940a

Add timestamp support to MySQL ORM. This allows working with timestamp columns and values in vlib/db/mysql/orm.v.

🤖 Generated by Copilot at d56940a

• Add support for timestamp data type in MySQL ORM (link, link, link, link)

• Allocate memory for timestamp data pointers in vlib/db/mysql/orm.v (link)
• Set buffer type to blob for timestamp bind parameters in vlib/db/mysql/orm.v (link)
• Convert timestamp data to time.Time values in V in vlib/db/mysql/orm.v (link)
• Format time.Time values as strings for timestamp columns in vlib/db/mysql/orm.v (link)