sqlt: More SQL types for Go

Overview

Note: This module should not be used in new code. The generic type database/sql.Null is available in the standard library since Go 1.22.

The sqlt package provides types that implement Go's database/sql.Scanner and database/sql/driver.Valuer interfaces:

• github.com/soroushj/sqlt.NullRawMessage - Nullable encoding/json.RawMessage
• github.com/soroushj/sqlt.NullUUID - Nullable github.com/google/uuid.UUID (Note: This type should not be used in new code. github.com/google/uuid.NullUUID is available since v1.3.0.)