[ITensors] Cannot compile a sysimage

[chiamin]

The documentation in this page (https://docs.itensor.org/ITensors/stable/getting_started/RunningCodes.html#Using-a-Compiled-Sysimage-in-Jupyter-or-VS-Code) for compiling a sysimage seems out of date. I got the following error when run ITensors.compile():

julia> ITensors.compile()
ERROR: MethodError: no method matching compile(::NDTensors.BackendSelection.Algorithm{:PackageCompiler, @NamedTuple{}})
The function compile exists, but no method is defined for this combination of argument types.

[mtfishman]

Thanks for pointing that out. In the latest versions you also have to explicitly load ITensorMPS and PackageCompiler along with ITensors, I made a PR updating that here: #1654.