feat: add adaptive stepsize SDE solver #17
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A new SDE solver is added which uses the Heun SDE method. However, the Heun method inherently also computes the Euler SDE step as well. This solver compares the Heun and Euler steps
dxvs the size of the noise termdw, if the two methods produce the samedxvector to within some accuracy (0.1 * dwby default) then the step is accepted and the next step is slightly longer. If the check fails then the step is recomputed with a smaller stepsize.