Add Latexify extension

[MilesCranmer]

TODO:

• Add to docs example page

[github-actions]

Benchmark Results

	master	8927c6b...	t[master]/t[8927c6b...]
search/multithreading	23.1 ± 0.71 s	22.7 ± 0.62 s	1.01
search/serial	29.8 ± 0.15 s	29.8 ± 0.024 s	0.997
utils/best_of_sample	0.842 ± 0.26 μs	0.862 ± 0.27 μs	0.977
utils/check_constraints_x10	12.2 ± 3.1 μs	12.1 ± 3.1 μs	1.01
utils/compute_complexity_x10/Float64	2.25 ± 0.12 μs	2.29 ± 0.13 μs	0.983
utils/compute_complexity_x10/Int64	2.31 ± 0.12 μs	2.26 ± 0.12 μs	1.02
utils/compute_complexity_x10/nothing	1.52 ± 0.13 μs	1.51 ± 0.11 μs	1.01
utils/optimize_constants_x10	28 ± 6.4 ms	28.4 ± 6.5 ms	0.988
time_to_load	1.34 ± 0.0058 s	1.33 ± 0.0046 s	1.01

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).