Add __call__ As Alias For RandomVariable sample Method

[AFg6K7h4fhy2]

This PR is aimed at cleaning up code in tutorials, tests, and elsewhere. The RandomVariable class in metaclass.py has an abstract sample method. Subclasses of RandomVariable typically are sampled. By having an alias for sample in __call__, MSR users need not continually write RV.sample(), as this will be done automatically.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.73%. Comparing base (7bd2250) to head (903fc2d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
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+ Coverage   92.69%   92.73%   +0.03%     
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  Files          40       40              
  Lines         904      908       +4     
==========================================
+ Hits          838      842       +4     
  Misses         66       66              

Flag	Coverage Δ
unittests	92.73% <100.00%> (+0.03%)	⬆️

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[damonbayer]

Thanks, @AFg6K7h4fhy2! There are some more places where explicit sample() calls could be replaced with the what you have done in this PR (for example, in the two models). Do you think we should pursue this in this PR or elsewhere?

[AFg6K7h4fhy2]

Thanks, @AFg6K7h4fhy2! There are some more places where explicit sample() calls could be replaced with the what you have done in this PR (for example, in the two models). Do you think we should pursue this in this PR or elsewhere?

A silly mistake was made. See DMs. I will cover the rest of these here.

[damonbayer]

@AFg6K7h4fhy2 Please review my changes from 903fc2d. If you approve of them (informally), I think this can be merged.

[AFg6K7h4fhy2]

I support your changes @damonbayer