Description
Fix Date and Timestamp format issues:
1.Optimize the description of CARBON_TIMESTAMP_FORMAT&CARBON_DATE_FORMAT in CarbonCommonConstants.java
2.Correct fields' definition of Date and Timestamp in examples.
3.Add example script how to show raw data's timestamp format. currently spark.sql.show() by default using "yyyy-mm-dd hh:mm:ss.fffffffff" as Timestamp.toString() format, users always wanting the show data same as raw data format.
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