Data simulation

[lzj1769]

We also need to simulate some datasets where the ground truth is known.

Maybe try it with SRTsim:
https://xzhoulab.github.io/SRTsim/02_Reference_Based_Example/

scGCO proposed a specific method for simulating SVGs:
https://github.com/WangPeng-Lab/scGCO/tree/master/code/analysis/Simulation

The simulation process is as follows:

1. Find spatial transcriptomics data with clear spatial patterns which can be different cell types or tissue structures
2. Using Splatter to generate synthetic data