Dynamic and static distributional rvs

[dylanhmorris]

This separates DistributionalRV into StaticDistributionalRV, in which the distribution is already instantiated (has fixed parameter values) and DynamicDistributionalRV, in which the distribution is instantiated when sample() is called with keyword arguments taken from the sample() call. The latter is designed to serve as a wrapper class for working with distributions with inferred parameters.

It also

• Renames the dist keyword arg to DistributionalRV to distribution, to avoid clashes given the standard numpyro pattern of import numpyro.distributions as dist.
• adds some basic tests for both subclasses

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.09%. Comparing base (7871f9a) to head (25fa99a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
model/src/pyrenew/metaclass.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   93.01%   93.09%   +0.07%     
==========================================
  Files          39       39              
  Lines         916      941      +25     
==========================================
+ Hits          852      876      +24     
- Misses         64       65       +1     

Flag	Coverage Δ
unittests	93.09% <96.77%> (+0.07%)	⬆️

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[damonbayer]

Really nice idea. Thanks @dylanhmorris!