Add dimension to AbstractShape

[JeffFessler]

To simplify things.

[codecov]

Codecov Report

Merging #37 (0a1307b) into main (bfd6ad5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          487       487           
=========================================
  Hits           487       487           

Impacted Files	Coverage Δ
src/object.jl	100.00% <ø> (ø)
src/object2.jl	100.00% <ø> (ø)
src/object3.jl	100.00% <ø> (ø)
src/cuboid.jl	100.00% <100.00%> (ø)
src/ellipse.jl	100.00% <100.00%> (ø)
src/ellipsoid.jl	100.00% <100.00%> (ø)
src/gauss2.jl	100.00% <100.00%> (ø)
src/gauss3.jl	100.00% <100.00%> (ø)
src/rect.jl	100.00% <100.00%> (ø)
src/triangle.jl	100.00% <100.00%> (ø)

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