implement `setproperty!` for modules (#44231)
This replaces #44137. As discussed on triage, instead of supporting
modules in `setfield!`, this adds two new builtins `getglobal` and
`setglobal!` explicitly for reading and modifying module bindings. We
should probably consider `getfield(::Module, ::Symbol)` to be
soft-deprecated, but I don't think we want to add any warnings since
that will likely just annoy people.
Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Co-authored-by: Dilum Aluthge <dilum@aluthge.com>
