Add hadamard product printing for mathml

[sylee957]

References to other Issues or PRs

Brief description of what is fixed or changed

I'm not sure if anything exists for mathml content printer.

Other comments

Release Notes

• printing
  • Add support for HadamardProduct in mathml presentation printer.

[sympy-bot]

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• printing
  • Add support for HadamardProduct in mathml presentation printer. (#16483 by @sylee957)

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#### References to other Issues or PRs
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#### Brief description of what is fixed or changed

I'm not sure if anything exists for mathml content printer.

#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
- printing
  - Add support for `HadamardProduct` in mathml presentation printer.
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Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #16483 into master will increase coverage by 0.173%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##            master   #16483       +/-   ##
============================================
+ Coverage   73.606%   73.78%   +0.173%     
============================================
  Files          618      619        +1     
  Lines       158593   158666       +73     
  Branches     37219    37186       -33     
============================================
+ Hits        116735   117064      +329     
+ Misses       36436    36195      -241     
+ Partials      5422     5407       -15

[oscarbenjamin]

This needs a test

[oscargus]

I will review this, but can you @sylee957 please add a screen dump of what the result looks like? (A test will also be an alternative as I can easily render it myself then.)

[sylee957]

So far, I have added two tests from test_latex

• mathml(HadamardProduct(X, Y*Y), printer="presentation")
  
• mathml(HadamardProduct(X, Y)*Y, printer="presentation")
  

Unfortunately, my web browser does not allow mathml, so I could only render with
http://www.mathmlcentral.com/Tools/FromMathML.jsp

[oscargus]

Looks good! I think the number of tests etc are OK. Are you planning to add more? If not, it can be merged.