[WIP] Add scope method to RandomVariable and use throughout for structured naming

[dylanhmorris]

Closes #228

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.90%. Comparing base (927603f) to head (b15a5d6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pyrenew/metaclass.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
- Coverage   97.91%   97.90%   -0.02%     
==========================================
  Files          51       51              
  Lines        1583     1620      +37     
==========================================
+ Hits         1550     1586      +36     
- Misses         33       34       +1     

Flag	Coverage Δ
unittests	97.90% <66.66%> (-0.02%)	⬇️

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