perf: align buffer to `Alignment::DEFAULT_ALIGNMENT = Alignment::new(256)` #32324

Job	Run time
Rust tests (windows-x64)	8m 21s
Rust tests (linux-arm64)	5m 57s
SQL logic tests	4m 41s
Rust build (wasm32 with default features)	8m 20s
Python (test)	2m 46s
Check build with minimal dependencies	2m 12s
Rust (docs)	3m 6s
validate-workflow-yaml	6s
C API test build	1m 4s
License Check and Audit Check (bans licenses sources)	51s
Rust (lint)	2m 30s
Rust build (all-features)	8m 46s
C/C++ (lint)	8s
Rust build (default features)	8m 40s
Python (lint)	1m 13s
Rust (lint, no default)	2m 35s
License Check and Audit Check (advisories)	55s
C++ build	4m 21s
Check generated source files are up to date	1m 3s
Java	2m 43s
Rust build (with tokio dispatcher)	2m 39s
lint-toml	8s
WASM integration smoke test	5m 52s
	1h 18m 57s

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