[Draft] Basic Enzyme support

[codecov[bot]]

Codecov Report

Attention: 50 lines in your changes are missing coverage. Please review.

Comparison is base (94f8519) 92.30% compared to head (387e431) 64.67%. Report is 1 commits behind head on main.

Files	Patch %	Lines
src/AutoDiff.jl	0.00%	50 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #22 +/- ## =========================================== - Coverage 92.30% 64.67% -27.64% =========================================== Files 5 5 Lines 117 167 +50 =========================================== Hits 108 108 - Misses 9 59 +50 ``` | [Flag](https://app.codecov.io/gh/lassepe/ParametricMCPs.jl/pull/22/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Lasse+Peters) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/lassepe/ParametricMCPs.jl/pull/22/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Lasse+Peters) | `64.67% <1.96%> (-27.64%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Lasse+Peters#carryforward-flags-in-the-pull-request-comment) to find out more.

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