Add AlloyDB vector writer. (#33841)

* Add AlloyDB vector writer. * Resolve comments. * Add default ConflictResolution as ON CONFLICT DO NOTHING. * Disable tests. * Fix docstring errors. * Simplify ColumnSpec's usage, add builder class to make it obvious what is default and how to override defaults or go full custom. * Fix linter error.

Add AlloyDB vector writer. (#33841)
* Add AlloyDB vector writer. * Resolve comments. * Add default ConflictResolution as ON CONFLICT DO NOTHING. * Disable tests. * Fix docstring errors. * Simplify ColumnSpec's usage, add builder class to make it obvious what is default and how to override defaults or go full custom. * Fix linter error.
138f5cb2 · claudevdm · GitHub · b794c67f · 138f5cb2 · 138f5cb2
--- a/sdks/python/apache_beam/ml/rag/ingestion/alloydb.py
+++ b/sdks/python/apache_beam/ml/rag/ingestion/alloydb.py
--- a/sdks/python/apache_beam/ml/rag/ingestion/alloydb_it_test.py
+++ b/sdks/python/apache_beam/ml/rag/ingestion/alloydb_it_test.py