Allow AbstractArray as inputs

[Avik Pal]

TaylorDiff.jl/src/derivative.jl

Line 34 in 126af68

 @inline function derivative(f, x::Vector{T}, l::Vector{T}, 

requires the inputs to be vectors. I was testing this package with Lux, and if we allow specifying the inputs as component arrays (i.e. allow abstract vectors) then the packages trivially compose.

[Songchen Tan]

Oh yes there definitely should be AbstractArrays. I was over specializing things. Will fix