BigQuery: Support time partitioned tables

[bluecmd]

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Right now BigQueryIO doesn't offer a way to specify that the tables, when created, should be marked as time partitioned.

Documentation: https://cloud.google.com/bigquery/docs/creating-partitioned-tables

What I would like is something like:

...
                .apply(BigQueryIO.Write
                        .setTimePartitioning(TimePartitioning.Type.DAY)
                        .withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND)
....