[Piggybank] Add UDFs to check if a String is an Integer And if a String is 
Numeric
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                 Key: PIG-2443
                 URL: https://issues.apache.org/jira/browse/PIG-2443
             Project: Pig
          Issue Type: New Feature
          Components: piggybank
            Reporter: Prashant Kommireddi
            Assignee: Prashant Kommireddi


UDF that could be used to check if a String is numeric (or an Integer). Several 
tools such as Splunk, AbInitio have this UDF built-in and companies making an 
effort to move to Hadoop/Pig could use this.

Use Case:
In raw logs there are certain filters/conditions applied based on whether a 
particular field/value is numeric or not. For eg, SPLIT A INTO CATEGORY1 IF 
IsInt($0), CATEGORY2 IF !IsInt($0);


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