Add Sharan, Brady, Livescu 2022 operators

[jlchan]

Adds operators from https://doi.org/10.1016/j.jcp.2022.111341 for cut-cell line domains

[jlchan]

Three higher derivative tests are currently failing locally due to roundoff issues. Since there's a parameter alpha::Float64 involved in the formulas, I am not sure that it is quite as accurate as the other operators.

Any suggestions?

[codecov]

Codecov Report

Merging #202 (c190555) into main (34aaa1e) will decrease coverage by 0.04%.
The diff coverage is 89.53%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   91.63%   91.60%   -0.04%     
==========================================
  Files          35       36       +1     
  Lines        5655     5741      +86     
==========================================
+ Hits         5182     5259      +77     
- Misses        473      482       +9     

Flag	Coverage Δ
unittests	91.60% <89.53%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/SummationByPartsOperators.jl	100.00% <ø> (ø)
src/SBP_coefficients/SharanBradyLivescu2022.jl	89.53% <89.53%> (ø)

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[coveralls]

coverage: 91.595% (-0.03%) from 91.627% when pulling c190555 on jlchan:jc/sharan_et_al into 34aaa1e on ranocha:main.

[ranocha]

Thanks a lot for the contribution!

[ranocha]

Thanks!