docs(bigquery): add arrow default write sample - #6512
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This pull request introduces a new Arrow default stream writer example for BigQuery, including the necessary dependencies and integration tests. The review suggests optimizing the schema serialization process by moving it outside the loop, refactoring make_batch to accept the pre-calculated schema length, and properly scoping the StreamWriter to address potential borrow checker issues while documenting safety invariants.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #6512 +/- ##
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Write the sample for
bigquerystorage_streamwriter_default_arrow.This corresponds to https://docs.cloud.google.com/bigquery/docs/write-api-streaming#java_3
Related to #5741