Add a deprecation warning filter for newer versions of NumPy

Earlier versions of Aesara still use the deprecated `np.product` function.

Preserve the identities of valued/observed variables

Fix ValueVariable checks

Explicitly compile functions in scipy_logprob_tester and update test_…

…vonmises_logprob

Explicitly remove AePPL IR from conditional_logprob results

Convert xfail test into a standard unit test

Refactor MeasurableElemwise and automatic random variable transforms

These changes make it possible for users to extend coverage of measurable
`Elemwise` transforms.  They also put these rewrites under the management of
Aesara's rewrite system, which means they can be applied more efficiently and
their use can customized and tracked with more granularity.

`sub`, `neg`, and `true_div` support is added, as well.

Associate transforms with random variables

Implement log-probability for StudentTRV

Fix remaining ShapeFeature import