add DatumWriter#sizeOf method that computes the number of bytes an object will 
be serialized as
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                 Key: AVRO-183
                 URL: https://issues.apache.org/jira/browse/AVRO-183
             Project: Avro
          Issue Type: New Feature
          Components: java
            Reporter: Doug Cutting
            Assignee: Doug Cutting


Sometimes it is useful to know how large an object will be when serialized 
before it is in fact serialized.

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