Updated the Rust integration to rextendr 0.5.0 and extendr 0.9.0,
resolving extendr crates from crates.io. Source installs now require
rustc 1.71 or newer. Vendored Rust crate attribution now points to crate
repository metadata when Cargo does not provide crate authors.
Fixed source installs on Windows ARM64 by selecting the
aarch64-pc-windows-gnullvm Rust target. Windows source installs now also
fail early with instructions if the required Rust target is not installed.
The README documents that Windows ARM64 source installs also require
Microsoft C++ Build Tools with ARM64 components.
Added a benchmarks article comparing read/write performance against the
yaml package (#2).