Fix stub generation for imported methods #1055
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Currently, stub generation mishandles the case where a method is actually a function imported from a different module. (It simply imports the name as the name of the method and calls it a day. A name never gets added to the class namespace.)
This can arise, for example, if one adds methods to nanobind-generated classes via monkeypatching.
Full disclosure: this is a bit of a drive-by PR. I did not investigate if/how type stubs are tested. If you'd like me to add testing or make other revisions, I would be happy to.