Add Turing integration tests

[mhauru]

Makes log density functions out of a bunch of Turing.jl models and checks that Enzyme can differentiate them, both in Forward and Reverse modes.

Related issues that should probably be sorted before merging this:

• No method matching Duplicated(::Base.MappingRF{...}, ::Base.RefValue{Base.MappingRF{…}}) #1812
• AssertionError: RT <: Array #1811
• Forward mode gradient AssertionError #1807

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All modified and coverable lines are covered by tests ✅

Project coverage is 69.92%. Comparing base (037dfed) to head (6154f90).
Report is 61 commits behind head on main.

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@@            Coverage Diff             @@
##             main    #1813      +/-   ##
==========================================
+ Coverage   67.50%   69.92%   +2.41%     
==========================================
  Files          31       32       +1     
  Lines       12668    13645     +977     
==========================================
+ Hits         8552     9541     +989     
+ Misses       4116     4104      -12     

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[wsmoses]

Can turing and all dependencies be pinned to exact versions

…

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[mhauru]

I changed the dependency from Turing to DynamicPPL and Distributions since we don't do any sampling. I pinnned those two and their major depencencies: AbstractMCMC, AbstractPPL, Bijectors, LogDensityProblems, LogDensityProblemsAD. Can pin all the dependencies if you'd like (BangBang, OrderedCollections, etc.), but I wonder if in that case it would make more sense to just commit the Manifest.toml.

[wsmoses]

@penelopeysm can you help get this integrated with the modern CI workflow for integration tests?