Allow GlobalRef and module qualified names in macro definitions (#53535)
The following is currently an error:
```
julia> module MyMacroModule
macro mymacro end
end
Main.MyMacroModule
julia> macro MyMacroModule.mymacro()
1
end
ERROR: syntax: invalid macro definition around REPL[2]:1
Stacktrace:
[1] top-level scope
@ REPL[2]:1
```
Discussing with Jeff, we didn't think there was any good reason not to
allow this, just a missing case in lowering. It's probably not
particularly useful (unlike the corresponding case for functions that is
used all the time), but it came up in writing a test case for #53515.
julia
136f018e - Allow GlobalRef and module qualified names in macro definitions (#53535)
