Modify the TEnum interface so it defines a method similar to findByValue
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                 Key: THRIFT-949
                 URL: https://issues.apache.org/jira/browse/THRIFT-949
             Project: Thrift
          Issue Type: Improvement
          Components: Java - Compiler, Java - Library
            Reporter: Mathias Herberts
            Priority: Trivial


In some cases, Thrift instances are converted into more simple types. This is 
made easy by the existence of the meta data map.

TEnum fields are usually converted to 'int' using getValue.

When converting back to Thrift, those 'int' need to be converted back to TEnum.

The generated TEnum classes have a static method findByValue, but as it is 
static it is not defined in the TEnum interface and therefore can only be 
accessed using reflection if the enum type is not know before runtime.

By adding a simple 'public TEnum getByValue(int value)' method in the TEnum 
interface, we could get rid of the reflection part. 

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