GraphPPL version 4.0.0

[wouterwln]

This PR reimplements GraphPPL to explicitly construct a factor graph representation of models. This allows nested models and a nicer model macro. This PR also adds tests and documentation to the new version

[codecov]

Codecov Report

Attention: Patch coverage is 91.81771% with 158 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@fca0b4b). Click here to learn what that means.

Files	Patch %	Lines
src/graph_engine.jl	89.23%	77 Missing ⚠️
src/model_macro.jl	88.81%	34 Missing ⚠️
...onal_constraints/variational_constraints_engine.jl	95.02%	22 Missing ⚠️
src/plugins/meta/meta_engine.jl	87.09%	12 Missing ⚠️
...ional_constraints/variational_constraints_macro.jl	94.11%	5 Missing ⚠️
src/resizable_array.jl	97.60%	3 Missing ⚠️
src/plugins/meta/meta.jl	87.50%	2 Missing ⚠️
src/plugins/meta/meta_macro.jl	95.12%	2 Missing ⚠️
src/plugins_collection.jl	95.83%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #204   +/-   ##
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  Coverage        ?   91.82%           
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  Files           ?       15           
  Lines           ?     1932           
  Branches        ?        0           
=======================================
  Hits            ?     1774           
  Misses          ?      158           
  Partials        ?        0           

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[bvdmitri]

Great work @wouterwln