Added example of change of variable in HMC

[karm-patel]

This PR is adding an example notebook for the change of variable in HMC as discussed in #252. This notebook mainly demonstrates,

1. BlackJAX implementation of Binomial hierarchical model
2. Change of variable trick in logprob() using jacobian
3. Using arviz plots to analyze MCMC diagnostics.

Let me know if I have to update anything in the notebook.

Note: Original source of this notebook is Dr. Kevin's pyprobml repo.

[codecov]

Codecov Report

Merging #254 (ace9a5b) into main (ff42aa6) will not change coverage.
The diff coverage is n/a.

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  Coverage   98.59%   98.59%           
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  Files          42       42           
  Lines        1709     1709           
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  Hits         1685     1685           
  Misses         24       24           

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[rlouf]

Thank you for the example! Merging.