Changes for GraphPPL v4

[bvdmitri]

This PR implements changes for GraphPPL v4

[codecov]

Codecov Report

Attention: Patch coverage is 40.82625% with 487 lines in your changes are missing coverage. Please review.

Project coverage is 71.27%. Comparing base (a8de9c0) to head (00c8023).

❗ Current head 00c8023 differs from pull request most recent head 56aed30. Consider uploading reports for the commit 56aed30 to get more accurate results

Files	Patch %	Lines
src/nodes/predefined/gamma_mixture.jl	0.00%	93 Missing ⚠️
src/nodes/predefined/mixture.jl	0.00%	91 Missing ⚠️
src/nodes/predefined/normal_mixture.jl	8.51%	86 Missing ⚠️
src/nodes/dependencies.jl	53.60%	45 Missing ⚠️
src/nodes/interfaces.jl	36.36%	28 Missing ⚠️
src/nodes/predefined/distribution/distribution.jl	0.00%	24 Missing ⚠️
src/nodes/predefined/delta/layouts/default.jl	0.00%	21 Missing ⚠️
src/nodes/nodes.jl	78.72%	20 Missing ⚠️
src/nodes/predefined/delta/delta.jl	48.48%	17 Missing ⚠️
src/score/node.jl	0.00%	14 Missing ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
+ Coverage   62.72%   71.27%   +8.55%     
==========================================
  Files         184      182       -2     
  Lines        5966     5170     -796     
==========================================
- Hits         3742     3685      -57     
+ Misses       2224     1485     -739     

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