Give a hand to downstream packages to update to v0.22

[Kolaru]

Many packages depending on IntervalArithmetic have not been able to update themselves to the newest version.

I think it would be great if we put some effort helping others, once the packages in JuliaIntervals are updated themselves.

In particular, all of the JuliaReach ecosystem is lagging behind, see e.g. JuliaReach/RangeEnclosures.jl#181

TODO List before v1.0:

• IntervalRootFinding
• IntervalConstraintProgramming
• IntervalContractor
• TaylorSeries
• TaylorModels
• LazySets (dependency of IntervalLinearAlgebra)
• IntervalLinearAlgebra
• IntervalOptimisation
• AffineArithemtic
• IntervalBoxes

[Kolaru]

The order in which we need to address the dependent packages:

• TaylorSeries
• TaylorModels
• LazySets and IntervalLinearAlgebra (mutually dependent)

In addition, adding several methods may help the downstream packages:

1. isthinzero(x::Real) to ease the usage in generic code
2. intersect_interval(X, Y ; decoration = :parent) to avoid always giving trv on set operations, which is in the standard, but otherwise seems to be what nobody wants

[OlivierHnt]

Note: on 0.22.23 version, iszero can be used for both interval and Number.

[lbenet]

1. TaylorSeries

Done in JuliaDiff/TaylorSeries.jl#345

[Kolaru]

Updated the first comment with a todo list.