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fix(distributions): compute the PowerTransform log-det in log space (#2332)

* fix(distributions): compute the PowerTransform log-det in log space

log|exponent * y / x| formed the ratio exponent * x ** (exponent - 1) first, which overflows or underflows for extreme x. InverseGamma, a PowerTransform(-1) of a Gamma, returned +inf log_prob at x=1e-20 and -inf at x=1e20 in float32.

* Remove the comment

* Remove the tests

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