Use RandomStream in examples

[brandonwillard]

This PR changes direct uses of aesara.tensor.random Ops to use RandomStream instead.

[codecov]

Codecov Report

Base: 95.15% // Head: 95.15% // No change to project coverage 👍

Coverage data is based on head (5908da4) compared to base (499a3fd).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   95.15%   95.15%           
=======================================
  Files          12       12           
  Lines        2023     2023           
  Branches      253      253           
=======================================
  Hits         1925     1925           
  Misses         56       56           
  Partials       42       42           

Impacted Files	Coverage Δ
aeppl/joint_logprob.py	95.00% <ø> (ø)
aeppl/printing.py	91.76% <ø> (ø)

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