Add Python interface to Triangle3

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Adds Python interface for Triangle3.

Related to #101 #210

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #247 (80baf10) into ign-math6 (f93eeea) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           ign-math6     #247   +/-   ##
==========================================
  Coverage      99.41%   99.41%           
==========================================
  Files             67       67           
  Lines           6347     6351    +4     
==========================================
+ Hits            6310     6314    +4     
  Misses            37       37           

Impacted Files	Coverage Δ
include/ignition/math/Triangle3.hh	100.00% <100.00%> (ø)

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[ahcorde]

friendly ping @scpeters