Implement MSC4133 and MSC4175, some bug fixes and features, drop target CPU for aarch64 to Cortex-A53, bump to Rust 1.81.0, RocksDB v9.6.1, and Nix build fixes

Implement MSC4133 and MSC4175, some bug fixes and features, drop target CPU for aarch64 to Cortex-A53, bump to Rust 1.81.0, RocksDB v9.6.1, and Nix build fixes #1049