Revise building transport map from samples in Python

[bonh]

See "Part 2: Building a Transport Map from Samples" of https://github.com/MeasureTransport/SIAMannual22/blob/6ab137a59642593ad2dd27476c1dbca6008668ed/tutorial_code_AN22.ipynb.

[bonh]

Add rv as function parameter in

MParT-examples/examples/python/FromSamples1D.py

Line 57 in 4b196a8

ref_logpdf_of_map_of_x = rv.logpdf(map_of_x)

[bonh]

We have a nice, working version of transport map from samples in 2D (banana). Do we still require the 1D example? I suggest we move this complex sample function from the 1D example to the 2D example and remove the 1D example.