Add bottleneck assignment (min–max assignment) solver

[jselvaraaj]

Feature request: add a linear bottleneck assignment solver (can also be used to solve lexicographic min‑max assignment).

Would it be useful for this repo to have exact linear bottleneck assignment solver?

If so I can write a JAX version of this javascript sovler for bottleneck assignment (Threshold search + Hopcroft–Karp matching).

[marcocuturi]

@jselvaraaj Thanks! yes, this could be a good fit for the tools section. I guess it could fit within linear.solvers too, but technically it's not a linear OT solver either, which is why I feel the tools section could work. I don't see this being re-used in other areas of OTT. Sounds like a robust type of assignment solver. Other location could be experimental