feat(athena): add start_query_executions for parallel query execution #3189
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Introduce `wr.athena.start_query_executions` as a parallelized variant of `start_query_execution`. It allows submitting multiple queries in one call, with support for: - Sequential or threaded submission (`use_threads`) - Lazy or eager consumption of results (`as_iterator`) - Per-query `client_request_token` (string or list) - Optional workgroup checks (`check_workgroup`, `enforce_workgroup`) - Full Athena cache integration This improves performance when dispatching batches of queries by reducing workgroup lookups and enabling concurrent execution.
…nd parallel wait - Simplified client_request_token handling: - Removed manual padding/truncation. - Let Athena enforce length constraints. - Tokens generated as `<base_token>-<index>` or provided as list. - Improved wait logic: - Added optional wait handling directly inside _submit. - Queries can now be waited in parallel with submission (reduced overhead). - Configurable default threads: - Replaced hardcoded defaults with os.cpu_count(). - Added support for AWSWRANGLER_THREADS_DEFAULT env var override.
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