Fit a polynomial to the tabulated resolution curves #88
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The spectral resolution curves in msaexp/data are taken from the tables provided in the NIRSpec documentation page.
This update implements using a polynomial fit to$f(\lambda) = \lambda / R$ to enable extrapolating the resolution curves of the gratings for wavelengths beyond the original tables. The function $f(\lambda)$ is nearly linear with $\lambda$ to a few percent across the nominal first-order spectral range of the gratings (see Jakobsen et al. 2022).