Add cast pushdown optimization for bit-packed integer widening #30331

Job	Run time
lint-toml	7s
Check build with minimal dependencies	1m 33s
C/C++ (lint)	7s
Python (test)	2m 19s
Python (lint)	48s
validate-workflow-yaml	7s
Rust build (default features)	2m 25s
WASM integration smoke test	2m 7s
Check generated source files are up to date	46s
Rust tests (windows-x64)	8m 56s
Rust (lint)	2m 37s
Rust build (all-features)	2m 22s
C API test build	39s
Rust (docs)	3m 3s
Public API lock files	1m 5s
Rust (lint, no default)	1m 48s
Rust tests (linux-arm64)	3m 47s
SQL logic tests	2m 24s
License Check and Audit Check (bans licenses sources)	44s
Java	2m 14s
License Check and Audit Check (advisories)	57s
C++ build	1m 48s
Rust build (wasm32 with default features)	1m 16s
Rust build (with tokio dispatcher)	1m 13s
	45m 12s

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