FRD extraction function for in-focus PSFs with noise

This ticket is a specific implementation of the algorithm-development for ticket PIPE2D-630. The purpose of this ticket is to generate a function/class that takes an arbitrarily generated in-focus image from Neven's code and solves for its FRD. Read noise, Poisson noise, and continuum will be added in this step. Thus, FRD extraction is not expected to be perfect, and the error in FRD extraction will be determined.