What would you like to be added:

Add go structs for the following time classes in jdk8:

• java.time.OffsetDateTime

• java.time.ZoneOffset

• java.time.OffsetTime

• java.time.ZoneDateTime

• java.time.Year

• java.time.YearMonth

• java.time.MonthDay

• java.time.Instant

• java.time.Duration

• java.time.Period

• java.time.LocalTime

• java.time.LocalDate

• java.time.LocalDateTime

• java.sql.Date

• java.sql.Time

• java.sql.Timestamp

Why is this needed:

these classes are very popular in jdk8.