JVP, HVP [in progress]

[sritchie]

• [ ] replace perturbed? with something that bubbles up perturbed candidates
• [ ] combine ->partials and extract so we can remove the replace-tag impl in Completed fully, that should never leak out anyway... would be great if that worked.
• [ ] add an extract-primal with support for supplying a tag
• [ ] for vjp, are we correctly handling function outputs? I think we are still only handling structural return values. think through and fix...
• [ ] Can I use extract-tangents with a continuation function to accomplish what I need to? does that get me the completed map that I need? that would be great, because then the same mechanism keeps outputs extensible and I only need to switch on the inputs, just like we do in derivative... I don't think so :(
• [ ] maybe I can do it with a mode argument
• [ ] think through with @littleredcomputer how to manage the versions that return the primal too. can we avoid code duplication?
• [ ] reference in the notes https://hackage.haskell.org/package/ad-4.5.5/docs/Numeric-AD-Mode-Kahn.html
• [ ] fix series output in symbolic-taylor-series test

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 47.22222% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 87.47%. Comparing base (bd47efd) to head (910a669).

Files	Patch %	Lines
src/emmy/calculus/derivative.cljc	47.22%	36 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #167 +/- ## ========================================== - Coverage 87.69% 87.47% -0.23% ========================================== Files 99 99 Lines 15791 15855 +64 Branches 850 851 +1 ========================================== + Hits 13848 13869 +21 - Misses 1093 1135 +42 - Partials 850 851 +1 ```

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