PARQUET-1883 Interpret deprecated INT96 as FIXED[12] in Avro conversion

[anantdamle]

https://issues.apache.org/jira/browse/PARQUET-1883

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• My PR addresses the following Parquet Jira issues and references them in the PR title. For example, "PARQUET-1234: My Parquet PR"

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• My PR adds the following unit tests
  TestAvroSchemaConverter.java
  Updated: TestAvroConverters.java

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[anantdamle]

Hi team,
How should I proceed? We have many old Parquet files still using INT96, this patch will at least help in reading those files using ParquertIO.readers in Apache Beam.