expand the list for the "hall of fame"---`example/targets`

[zuhengxu]

• [x] synthetic examples that are challenging to sample
  • [x] Banana
  • [x] Cross distribution
  • [x] warped Gaussian
  • [x] neal's funnel

[zuhengxu]

Please suggested more interesting synthetic distributions for sampling!

[cpfiffer]

This is an idle thought that might be cool, could we sample from the Datasaurus Dozen?

[zuhengxu]

This is an idle thought that might be cool, could we sample from the Datasaurus Dozen?

This looks fun! I'm keeping this link to the dataset for reference: https://github.com/jumpingrivers/datasauRus