Make thrift version a property in pom.xml

In parquet-mr, the version of the thrift dependency is controlled by a property and can be overridden from the command line, for example `mvn clean verify -Dthrift.version=0.9.0`.

In parquet-format, however, the version number of thrift is hard-coded in the pom.xml and a different version can only be used by modifying pom.xml itself.

The thrift version should be a property in Parquet-format as well.