Create a SDSS-like Cluster Cosmology (number counts and mean masses) analysis example.

[yyzhang]

Discussed in #436

^{Originally posted by yyzhang July 15, 2024}
Issue: create an example to derive cosmology from SDSS-like cluster observables (e.g., https://arxiv.org/pdf/1810.09456) with simplified models.

This includes creating new ini files, and SACC files to reflect the SDSS cluster observables (number counts and mean masses).

@m-aguena @combet