[ENHANCEMENT] Slicing operations like a["i" => 1, "j" => 1:2] = randn(2) are broken

[mtfishman]

For example:

julia> using NamedDimsArrays

julia> a = nameddims(randn(2, 2), ("i", "j"))
named(2, named(Base.OneTo(2), "i"))×named(2, named(Base.OneTo(2), "j")) NamedDimsArray{Float64, 2, Matrix{Float64}, Tuple{NamedDimsArrays.NamedUnitRange{Int64, Base.OneTo{Int64}, String}, NamedDimsArrays.NamedUnitRange{Int64, Base.OneTo{Int64}, String}}} with indices named(Base.OneTo(2), named(Base.OneTo(2), "i"))×named(Base.OneTo(2), named(Base.OneTo(2), "j"))
2×2 Matrix{Float64}:
 0.754816  -0.227494
 0.150338   0.337033

julia> a["i" => 1, "j" => 1:2] = randn(2)
ERROR: MethodError: no method matching getindex(::Tuple{NamedDimsArrays.NamedUnitRange{Int64, Base.OneTo{…}, NamedDimsArrays.NamedUnitRange{…}}}, ::Nothing)
The function `getindex` exists, but no method is defined for this combination of argument types.

Closest candidates are:
  getindex(::Tuple, ::CartesianIndex{1})
   @ Base multidimensional.jl:908
  getindex(::Tuple, ::Int64)
   @ Base tuple.jl:31
  getindex(::Tuple, ::Colon)
   @ Base tuple.jl:36
  ...

Stacktrace:
  [1] (::NamedDimsArrays.var"#57#58"{Tuple{NamedDimsArrays.NamedUnitRange{Int64, Base.OneTo{…}, NamedDimsArrays.NamedUnitRange{…}}}})(i::Nothing)
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:818
  [2] map
    @ ./tuple.jl:355 [inlined]
  [3] set_check_broadcast_shape(ax1::Tuple{NamedDimsArrays.NamedUnitRange{…}}, ax2::Tuple{NamedDimsArrays.NamedUnitRange{…}})
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:818
  [4] check_broadcast_shape(ax1::NamedDimsArrays.NaiveOrderedSet{Tuple{NamedDimsArrays.NamedUnitRange{…}}}, ax2::NamedDimsArrays.NaiveOrderedSet{Tuple{NamedDimsArrays.NamedUnitRange{…}}})
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:810
  [5] check_broadcast_axes
    @ ./broadcast.jl:550 [inlined]
  [6] instantiate
    @ ./broadcast.jl:305 [inlined]
  [7] materialize!(::NamedDimsArrays.NamedDimsArrayStyle{…}, dest::NamedDimsArray{…}, bc::Base.Broadcast.Broadcasted{…})
    @ Base.Broadcast ./broadcast.jl:878
  [8] materialize!
    @ ./broadcast.jl:875 [inlined]
  [9] setindex!(a::NamedDimsArray{…}, value::NamedDimsArray{…}, I1::NamedDimsArrays.NamedInteger{…}, Irest::NamedDimsArrays.NamedUnitRange{…})
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:571
 [10] setindex!(a::NamedDimsArray{…}, value::Vector{…}, I1::NamedDimsArrays.NamedInteger{…}, Irest::NamedDimsArrays.NamedUnitRange{…})
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:581
 [11] setindex!(a::NamedDimsArray{Float64, 2, Matrix{…}, Tuple{…}}, value::Vector{Float64}, I1::Pair{String, Int64}, Irest::Pair{String, UnitRange{…}})
    @ NamedDimsArrays ~/.julia/dev/NamedDimsArrays/src/abstractnameddimsarray.jl:464
 [12] top-level scope
    @ REPL[3]:1
Some type information was truncated. Use `show(err)` to see complete types.