Add ChiSquareRV
JAX implementation
#1363
Merged
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Closes #1322
Given the shape/rate parametrization of$$\chi^2_{\text{df}} \equiv \Gamma\left(\frac{\text{df}}{2}, \frac{1}{2} \right).$$
GammaRV
in Aesara, this addition uses the fact thatWiki reference here