Add a conftest.py file

This will cause tests to fail when optimization and shape errors are present.

Use specialized `CheckParameterValue` `Op` in logprob graphs

Ignore tag information in `rvs_to_value_vars`

Add Gitter badge

Revert "Allow both edges of IntervalTransform to be None"

This reverts commit 9298dac.

Compute logprob constants using Aesara

This provides consistency between `aesara.config.floatX` and the `logprob`
return dtypes.

Keep original value variables as keys in factorized_joint_logprob

A new method in `PreserveRVMappings` called `update_rv_maps` can be used to
update random variable and/or value variable mappings.  It is currently used by
the `transform_values`, `incsubtensor_rv_replace`, and `find_measurable_scans`
rewrites, which act directly on value variables.

Remove unused name handling in transformed_logprob

Prevent value variables from being cloned in joint_logprob

Update factorized_joint_logprob docstring

Co-authored-by: Brandon T. Willard <971601+brandonwillard@users.noreply.github.com>