feat(path): getRegularPolygonPath

[ShaMan123]

a util curtesy of @nickvans
closes #2437

https://jsfiddle.net/tqrms0ae/

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.92 |    75.84 |   85.64 |   82.65 |                                               
 fabric.js |   82.92 |    75.84 |   85.64 |   82.65 | ...,30871,30945,30956-31021,31144,31243,31479 
-----------|---------|----------|---------|---------|-----------------------------------------------

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.93 |    75.87 |   85.64 |   82.66 |                                               
 fabric.js |   82.93 |    75.87 |   85.64 |   82.66 | ...,30871,30945,30956-31021,31144,31243,31479 
-----------|---------|----------|---------|---------|-----------------------------------------------

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.95 |    75.89 |   85.64 |   82.68 |                                               
 fabric.js |   82.95 |    75.89 |   85.64 |   82.68 | ...,30866,30940,30951-31016,31139,31238,31474 
-----------|---------|----------|---------|---------|-----------------------------------------------

[asturur]

I remember this function from that issue.
Can we add a simple test for 5 and 6 points to match a pre-defined string?
so that if the function gets changed the test needs to be updated and we can stop and think

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.95 |    75.89 |   85.64 |   82.68 |                                               
 fabric.js |   82.95 |    75.89 |   85.64 |   82.68 | ...,30866,30940,30951-31016,31139,31238,31474 
-----------|---------|----------|---------|---------|-----------------------------------------------

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.95 |    75.89 |   85.64 |   82.68 |                                               
 fabric.js |   82.95 |    75.89 |   85.64 |   82.68 | ...,30866,30940,30951-31016,31139,31238,31474 
-----------|---------|----------|---------|---------|-----------------------------------------------

[github-actions]

Code Coverage Summary

> fabric@5.1.0 coverage:report
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   83.07 |    75.96 |   85.71 |   82.79 |                                               
 fabric.js |   83.07 |    75.96 |   85.71 |   82.79 | ...,30866,30940,30951-31016,31139,31238,31474 
-----------|---------|----------|---------|---------|-----------------------------------------------