Feature/line equality

[hyrodium]

This PR fixes #105.

[hyrodium]

Here's an example of intransitivity of ==(::Line, ::Line) which is discussed in this comment.

l1 = Line{2, Float64}(Point(0.0, 0.0), Point(1.0, 2.01027582027942e-9))
l2 = Line{2, Float64}(Point(0.0, 0.0), Point(1.0, 0.0))
l3 = Line{2, Float64}(Point(0.0, 0.0), Point(1.0, -1.4337470895339735e-8))

l1 == l2  # true
l2 == l3  # true
l1 == l3  # false

[hyrodium]

The ci Julia 1 - macos-latest - x64 - pull_request is failing, but it seems like this PR is not relevant.

[juliohm]

Amazing PR @hyrodium , thanks for the very nice and clean code. Appreciate if you can take a look at the comments before we merge it. The build failing on MacOS is indeed unrelated.

[juliohm]

Thanks! Nice to have you around. Looking forward to more thoughtful discussions and improvements.