refactor: Fitting and Finding algorithm function interface #922
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Changes both the fitting and the finding algorithm to use a regular
interface with virtual methods rather than std::function to decouple the
actual fitter/finder instances. The decoupling is only for compile-time
memory usage reduction. The reason is that pybind11 does a round trip
throught python with std::function, which we want to avoid. This is
functionally equivalent, but uses a different mechanism.
Also adds factory functions for these decoupled objects. We don't
foresee these to be switchable, this decoupling is done for purely
technical reasons anyway.