Use FastLDF and removal of NodeTrait

[penelopeysm]

I only changed HMC/NUTS here to use FastLDF for now.

I think the easier thing is if we replace LogDensityFunction in DynamicPPL, then we don't need to change it here.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.03%. Comparing base (4153a83) to head (1544a40).

Files with missing lines	Patch %	Lines
src/mcmc/gibbs.jl	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2713      +/-   ##
==========================================
- Coverage   86.47%   82.03%   -4.45%     
==========================================
  Files          21       21              
  Lines        1420     1414       -6     
==========================================
- Hits         1228     1160      -68     
- Misses        192      254      +62     

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[github-actions]

Turing.jl documentation for PR #2713 is available at:
https://TuringLang.github.io/Turing.jl/previews/PR2713/

[mhauru]

I think the easier thing is if we replace LogDensityFunction in DynamicPPL, then we don't need to change it here.

Agreed.