`checkbounds` with keyword arguments

[penelopeysm]

I'd like to be able to check whether I can index into a DimArray. With most AbstractArrays this can be done with Base.checkbounds, but there isn't an overload for DimArray that accepts keyword arguments. Should there be one? (And if not, what's the best way for me to check whether I can index in?)

julia> x = DimArray(rand(2, 3), (:a, :b))
┌ 2×3 DimArray{Float64, 2} ┐
├──────────────────── dims ┤
  ↓ a, → b
└──────────────────────────┘
 0.737598  0.621954  0.0407873
 0.303194  0.466593  0.763799

julia> x[a=1]
┌ 3-element DimArray{Float64, 1} ┐
├────────────────────────── dims ┤
  ↓ b
└────────────────────────────────┘
 0.737598
 0.621954
 0.0407873

julia> checkbounds(Bool, x; a=1)
ERROR: MethodError: no method matching checkbounds(::Type{…}, ::DimMatrix{…}; a::Int64)
This method may not support any kwargs.

[rafaqz]

Good idea. We should allow that and `checkbounds(Bool, x, X(2), Y(3))