Add NewtonDoglegCauchy Trust region nonlinear solver
Most of new features is in Dogleg line search method, but setting the initial trust region must be done outside the Newton iteration. Hence a new solver is created that sets it properly and then delegates everything to NewtonMethod. Setting initial TrustRegion radius is still questionable. One paper says it is proportional to initial solution guess, but that fails when the guess is zero function.
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