Overload Polygon constructor for accuracy, loosen Point requirement.

[andrewstart]

Description of change

• Overloads the Polygon constructor to specify that you may pass in a single array of Points/numbers, or a list of Points/numbers. Attempting to pass in a list of arrays is now a compile error.
• Updates linting rules to allow Typescript method overloading.
• Changes the Point check inside the constructor to allow for anything fitting the IPoint interface rather than just Point instances, which is more relaxed - really this should allow simple {x, y} objects, but I wanted to keep this PR light.

Pre-Merge Checklist

• Lint process passed (npm run lint)
• Tests passed (npm run test)

A note on the no-dupe-class-members rule - the Typescript compiler will throw an error on a failure here, so it won't be as meaningful going forward. Additionally, there is an open PR to typescript-eslint to add their own variant that can handle overloading.

[codecov-io]

Codecov Report

Merging #6378 into dev will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             dev   #6378   +/-   ##
=====================================
  Coverage   74.7%   74.7%           
=====================================
  Files        105     105           
  Lines       6053    6053           
=====================================
  Hits        4522    4522           
  Misses      1531    1531

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