Fix: more typescript definitions

[gianluca-moro]

• Added more Typescript definitions
• Fixed some typos and wrong types in the paintLabels, painPolygon, paintPolygons and paintPolylines function documentations

[codecov]

Codecov Report

Base: 84.43% // Head: 84.43% // No change to project coverage 👍

Coverage data is based on head (238eece) compared to base (7145692).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           legacy     #606   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         163      163           
  Lines        5697     5697           
  Branches     1424     1424           
=======================================
  Hits         4810     4810           
  Misses        790      790           
  Partials       97       97           

Impacted Files	Coverage Δ
src/image/operator/paintLabels.js	0.00% <ø> (ø)
src/image/operator/paintPolygon.js	100.00% <ø> (ø)
src/image/operator/paintPolygons.js	100.00% <ø> (ø)
src/image/operator/paintPolylines.js	100.00% <ø> (ø)

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