Specialize in(x::Union{Sym,Term,Num}, I::TypedEndpointsInterval)

[jishnub]

Along with JuliaMath/IntervalSets.jl#126, this helps avoid ambiguities such as in JuliaApproximation/ApproxFun.jl#847

Let's wait for a decision on JuliaMath/IntervalSets.jl#126 before this

Edit: I've updated this to define in for TypedEndpointsInterval. Adding IntervalSets as a dependency does not impact load times, as it's loaded by DomainSets anyway. While TypedEndpointsInterval is not exported by IntervalSets, it's quite a fundamental type as, among other things, Interval and ChebyshevInterval are subtypes of this.

With this PR, the following works:

julia> using Symbolics

julia> @variables x
1-element Vector{Num}:
 x

julia> using DomainSets

julia> x in ChebyshevInterval()
Symbolics.VarDomainPairing(x, -1.0..1.0 (Chebyshev))

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❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.81%. Comparing base (3bad882) to head (2ee927e).
⚠️ Report is 2169 commits behind head on master.

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@@            Coverage Diff             @@
##           master     #797      +/-   ##
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- Coverage   76.83%   76.81%   -0.03%     
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[benjione]

Is there some progress on that?
I would benefit from this being merged, enabling me to use SumOfSquares.jl together with ApproxFun.jl.