Can AxisVector support push!/pop!/deleteat! ?

[ameligrana]

This seems currently not implemented (by also looking inside the library):

julia> a = AxisArray([1,2,3], [4,5,7])

julia> push!(a, 4, 8) # not sure actually how to do it
ERROR: MethodError: no method matching resize!(::AxisVector{Int64, Vector{Int64}, Tuple{Axis{:row, Vector{Int64}}}}, ::Int64)

Closest candidates are:
  resize!(::BitVector, ::Integer)
   @ Base bitarray.jl:814
  resize!(::Vector, ::Integer)
   @ Base array.jl:1312

Stacktrace:
 [1] _append!(a::AxisVector{Int64, Vector{Int64}, Tuple{Axis{:row, Vector{…}}}}, ::Base.HasLength, iter::Tuple{Int64, Int64})
   @ Base ./array.jl:1196
 [2] append!(a::AxisVector{Int64, Vector{Int64}, Tuple{Axis{:row, Vector{Int64}}}}, iter::Tuple{Int64, Int64})
   @ Base ./array.jl:1187
 [3] push!(::AxisVector{Int64, Vector{Int64}, Tuple{Axis{:row, Vector{Int64}}}}, ::Int64, ::Int64)
   @ Base ./array.jl:1188
 [4] top-level scope
   @ REPL[61]:1
Some type information was truncated. Use `show(err)` to see complete types.

Can these methods be supported?