stats: use fast-float to convert string to float
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…ter than std's parse Even Polars started using it, even if fast-float's algorithm was adapted into core. stand-alone fast-float crate was still faster see pola-rs/polars#7492
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which is markedly faster than Rust core's string to float conversion, even if the fast-float algorithm was adapted in core.
see /~https://github.com/aldanor/fast-float-rust#benchmarks,
pola-rs/polars#7492 and
https://arxiv.org/abs/2101.11408