Benchmark for fast way to read record chunks

[nazar-pc]

#2581 changed sector record chunks behavior on Windows to read the whole sector rather than individual chunks. Turns out it is not platform-specific and not one-size-fits-all.

This PR exposes two options in the API of subspace-farmer-components and implements a benchmark to pick the best one for each farm specifically, improving chances of proving in time.

Benchmark is primitive: simply tired both ways 3 times and picks whichever was the fastest all all. This is very naive, but quick and should be still representative of relative differences of both approaches relatively to each other.

Fixes #2591

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