Support async stream pipeline stages

[andrewtdiz]

Summary

• support callback and promises pipeline flows with function, async-generator, sync iterable, and async-iterable stages
• preserve stream pipe lifecycle behavior while routing collected pipeline stages through callbacks or promises
• keep async generator closures out of async-to-generator closure rewriting and reject Array.fromAsync next() failures
• split native stream tests to satisfy the source file-size gate

Tests

• cargo fmt --check
• ./scripts/check_file_size.sh
• ./scripts/regen_api_docs.sh
• git diff --check origin/main..HEAD
• jq empty test-parity/known_failures.json
• RUST_TEST_THREADS=1 cargo test -p perry-runtime
• cargo test -p perry-transform
• cargo check -p perry-runtime -p perry-transform -p perry-codegen
• ./run_parity_tests.sh --suite node-suite --module stream/pipeline (15 pass, 0 fail)
• ./run_parity_tests.sh --suite node-suite --module stream/promises (17 pass, 1 existing known failure: node-suite/stream/promises/finished-rejects-on-error)