[CAPI]Add send orderly messages by sharding key.

[ShannonDing]

1. Please describe the feature you are requesting.
   simply sending an orderly message by sharding key
2. Provide any additional detail on your proposed use case for this feature.
   simply sending an orderly message by sharding key, such as :
   int SendMessageOrderlyByShardingKey(CProducer* producer,
   CMessage* msg, const char * shardingKey, CSendResult* result);
3. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this issue?
   should-have

[ShannonDing]

close due to #188