Add RecipesBase as an extension

[OlivierHnt]

Closes #605.

In the future we should add recipes like this for Makie.jl.

[lorenzgillner]

Please note that there is a typo in ext/IntervalArithmeticRecipesBaseExt.jl: in lines 5 and 19 AbstractVector is spelled incorrectly, resulting in an error when plotting boxes.

[OlivierHnt]

🤦‍♂️ my bad

[Joel-Dahne]

Looks good! Only comment I have is that it would maybe make sense to also support BareInterval. But I haven't really understood the new role of BareInterval, so it might not make sense.

[OlivierHnt]

Indeed, that crossed my mind. But I figured, it is better to be a bit conservative, at least for the time being.

An important aspect of the 0.22 versions is that one should always use Interval and never BareInterval; except perhaps in performance critical code, where the user has also a clear understanding of the operations taking place to make sense of the output.
E.g.

julia> sqrt(bareinterval(-1, 1))
[0.0, 1.0]

julia> sqrt(interval(-1, 1))
[0.0, 1.0]_trv