Interpolate palette colors in order to ensure colormaps always have the same number of colors #249
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This PR implements interpolation of palette colors in order to better control their display by API clients.
There is a new setting
ARPAV_PPCV__PALETTE_NUM_STOPS=5which controls the size of a palette. Additionally, the color attributed to each stop in the palette is now linearly interpolated among all the colors that are defined in the corresponding.palfile. This ensures the backend is sending a fixed number of palette colors, regardless of the palette definition.Color interpolation uses matplotlib's ListedColormap class