Is your feature request related to a problem? Please describe.
After offline discussion with @wyli and @holgerroth , seems for most user cases, need to call LoadImaged + EnsureChannelFirstd together and we came across the channel dim issue multiple times.
Would be nice to add an option in LoadImaged to ensure channel first.
I suggest to make default to False , as we suppose every transform to do single function, same as the resample in ImageWriters.