Add Gray Scott model

[lukem12345]

Add an example of the Gray Scott chemical reaction model as a Decapode.

I will leave this as a draft until I study this model some more and verify that the phenomena that we observe are correct.

This should also be managed using the DrWatson.jl system along with the current Brusselator example.

[jpfairbanks]

These look pretty good!

[lukem12345]

After amending the typo pointed out by @djinnome , the Gray-Scott model with the given initial conditions exhibits the following dynamics on the plane. The sphere gif is too large to upload, but behaves similarly to above.

[lukem12345]

There's a merge conflict that I'll look at later. The current gray_scott.jl script is updated to the most recent version of Decapodes, and so can be downloaded and run there

[jpfairbanks]

I think that was a false positive on the merge conflict. I just did a git merge locally and it reported no conflicts.

[lukem12345]

Great, feel free to merge in Gray-Scott pending your review.

[jpfairbanks]

Approved, just waiting for tests

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ca86084) 88.40% compared to head (f584fdd) 88.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #114   +/-   ##
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  Coverage   88.40%   88.40%           
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  Files           9        9           
  Lines        1009     1009           
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  Hits          892      892           
  Misses        117      117           

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