Mark Sampling context as not needing derivatives

[wsmoses]

No description provided.

[devmotion]

Is it possible to add a simple test for this change? Generally, it might also be a good candidate for an extension.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c9489aa) 80.24% compared to head (b3a3757) 80.26%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/DynamicPPL.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #556      +/-   ##
==========================================
+ Coverage   80.24%   80.26%   +0.01%     
==========================================
  Files          25       26       +1     
  Lines        3159     3167       +8     
==========================================
+ Hits         2535     2542       +7     
- Misses        624      625       +1     

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[yebai]

I'm happy with the changes but perhaps convert this to an extension

[wsmoses]

So the only dependency here is our interface package EnzymeCore, rather than the fully heavyweight Enzyme. Extension is fine, but this is similar to how ChainRulesCore is currently used within this package already.

[wsmoses]

@devmotion done

[devmotion]

There are a few dependencies that were added before support for weak dependencies was available and should be made weak dependencies (e.g. Test #550, ChainRulesCore, and ZygoteRules).

[torfjelde]

Just a few comments:)

[yebai]

Thanks @wsmoses @devmotion @torfjelde!