feat: update ConvMixer to support reactant

[avik-pal]

• Needs conv adjoints conv gradient is not implemented in EnzymeJAX EnzymeAD/Reactant.jl#214
• Needs reduce_window adjoint -- we could potentially work around this

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.77%. Comparing base (04494b5) to head (e5d140c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/layers/pooling.jl	0.00%	4 Missing ⚠️
ext/LuxReactantExt/patches.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (04494b5) and HEAD (e5d140c). Click for more details.

HEAD has 49 uploads less than BASE

Flag	BASE (04494b5)	HEAD (e5d140c)
	72	23

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1063       +/-   ##
===========================================
- Coverage   83.79%   73.77%   -10.02%     
===========================================
  Files         147      146        -1     
  Lines        6036     6014       -22     
===========================================
- Hits         5058     4437      -621     
- Misses        978     1577      +599     

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[github-actions]

Benchmark Results (ASV)

	main	e5d140c...	main/e5d140c3b4096b...
basics/overhead	0.12 ± 0.00066 μs	0.133 ± 0.0019 μs	0.905
time_to_load	1.14 ± 0.0082 s	1.15 ± 0.0046 s	0.998

Benchmark Plots

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Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).