Inplace GriddedInterpolation is not available

[jaemolihm]

For B-splines, in-place interpolation is possible. But for GriddedInterpolation, it is not.

My motivation for doing that is to make the coefs a view of a larger array which will be dynamically updated. I could copy the values from the large array to itp.coefs every time, but this is unnecessary if the in-place gridded interpolation is possible.

x = 1:4
y_large = [2, 4, 6, 8, 10]
y = view(y_large, 1:4)
f1 = interpolate!(y, BSpline(Linear()))
f2 = interpolate((x,), y, Gridded(Linear()))
# f2 = interpolate!((x,), y, Gridded(Linear())) # Does not work
@show f1(2.5), f2(2.5) # 5.0, 5.0

y_large .= 0
@show f1(2.5), f2(2.5) # 0.0, 5.0