THRIFT-139. java: Expose field ids in more useful ways

- Define constants in each structure class that provide access to the
  field ids by name (at compile time).  Use them for (de)serialization.
- For beans-mode code, generate a generic getter and setter for accessing
  fields by field id.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@703028 13f79535-47bb-0310-9956-ffa450edef68
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