Support STRUCT, FLOAT64, INT64 BigQuery types in BigQuery to Avro schema conversion.

We already support RECORD, FLOAT, and INTEGER, which are aliases of the three types being added.

(The same as #11923, but for Java (instead of Python).)

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ValidatesRunner compliance status (on master branch)

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Examples testing status on various runners

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Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

Pre-Commit Tests Status (on master branch)

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GitHub Actions Tests Status (on master branch)

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