[BUG] Outdated interface description of SeekByTime

[Gleiphir2769]

I noticed that the interface description of SeekByTime is outdated.

pulsar-client-go/pulsar/consumer.go

Lines 268 to 276 in d92fb14

	// SeekByTime resets the subscription associated with this consumer to a specific message publish time.
	//
	// Note: this operation can only be done on non-partitioned topics. For these, one can rather perform the seek() on
	// the individual partitions.
	//
	// @param time
	// the message publish time when to reposition the subscription
	//
	SeekByTime(time time.Time) error

The currently interface description said Seek() and SeekByTime() does not support partitioned topic consumer. But in #782 , @GPrabhudas has introduced the consumer seek by time on partitioned topic.

I think we should remove the legacy interface description of SeekByTime