Add support for multiple result in value

[blegat]

These should accept a result keyword

PolyJuMP.jl/src/variable.jl

Lines 3 to 17 in 8eb5802

	function JuMP.value(
	t::AbstractTerm{<:JuMP.AbstractJuMPScalar},
	f::Function = JuMP.value,
	)
	return JuMP.value(MultivariatePolynomials.coefficient(t), f) * monomial(t)
	end
	function JuMP.value(
	p::AbstractPolynomialLike{<:JuMP.AbstractJuMPScalar},
	f::Function = JuMP.value,
	)
	return polynomial(
	JuMP.value.(terms(p), f),
	MultivariatePolynomials.SortedUniqState(),
	)
	end

like
https://github.com/jump-dev/JuMP.jl/blob/6901e8f98bf24242a141e003e42530fa90f33c3c/src/aff_expr.jl#L493-L495