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

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?

Start with the AxisVector implementation in the AxisArrays library and reproduce the push! example from the issue. Determine how push!, pop!, and deleteat! should update both values and axis metadata, then verify that these operations work for AxisVector without the resize! MethodError shown.