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Add more luminosity-function model parametrizations #13

@nikosarcevic

Description

@nikosarcevic

LFKit currently focuses mainly on Schechter-style LF models. We should extend the model registry with additional common LF parametrizations so the package is useful beyond standard galaxy Schechter fits.

Useful models to add:

[ ] - Saunders / modified Schechter model
[ ] - double power law
[ ] - log-normal LF
[ ] - Gaussian-in-magnitude LF
[ ] - tabulated or binned LF model

Motivation:
Schechter and double-Schechter models are very useful, but they do not cover all common LF use cases. Saunders-like forms are often used for infrared or star-forming galaxy LFs, double power laws are common for AGN/quasar and high-redshift UV LFs, and log-normal or Gaussian forms are useful for specific populations or CLF components.

Desired outcome:
New LF models should be added through the existing model registry/API machinery, with tests and minimal examples. Adding these models should not require duplicating API plumbing.

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