Add option to enable useAvroLogicalTypes option in LoadJobConfiguration

[jbergbrede]

In order to be able to load a BigQuery table partitioned on a DATE column using Avro, the option useAvroLogicalTypes has to be activated in LoadJobConfiguration. Otherwise, BigQuery reads DATE columns as INTEGER as documented here: https://cloud.google.com/bigquery/docs/loading-data-cloud-storage-avro#logical_types

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[jbergbrede]

@googlebot I signed it!

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[jbergbrede]

@googlebot I fixed it.

[davidrabinowitz]

Thanks for the contribution! Can you please update connector/src/test/java/com/google/cloud/spark/bigquery/SparkBigQueryConfigTest.java as well?

[jbergbrede]

Thanks for the contribution! Can you please update connector/src/test/java/com/google/cloud/spark/bigquery/SparkBigQueryConfigTest.java as well?

Done

[davidrabinowitz]

Notice this is Google truth assertThat()

[davidrabinowitz]

/gcbrun