Switch benchmarks to criterion for more accurate profiling #20
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While profiling the changes made in #14 and https://github.com/SenseLabsDE/contour-rs/tree/grid I noticed that I barely got any samples. After asking in the Rust Discord, this turned out to be due to the native Rust benchmarks not running for long enough.
This PR switches the benchmarks over to criterion which amongst other features runs the benchmarks for a longer time and leads to substantially better perf data. It also comes with the bonus of not requiring a nightly compiler, unlike the current benchmarks.