Add MathIntegral class

[tvale1]

Added Math Integral class

[dolanmiu]

Thank you!

I have fixed the prettier and linting issues, and wrote a test

When it passes, I will make sure to merge

[codecov-commenter]

Codecov Report

Base: 99.70% // Head: 99.70% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (6dcf3f2) compared to base (0594559).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1700   +/-   ##
=======================================
  Coverage   99.70%   99.70%           
=======================================
  Files         318      319    +1     
  Lines        3688     3704   +16     
  Branches      401      404    +3     
=======================================
+ Hits         3677     3693   +16     
  Misses         11       11           

Impacted Files	Coverage Δ
src/file/paragraph/math/math-component.ts	100.00% <ø> (ø)
src/file/paragraph/math/n-ary/index.ts	100.00% <100.00%> (ø)
src/file/paragraph/math/n-ary/math-integral.ts	100.00% <100.00%> (ø)
...file/paragraph/math/n-ary/math-n-ary-properties.ts	100.00% <100.00%> (ø)

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