Add support for unqualified imports with renaming, e.g.:
from project.Error.Error import throw as error_throw

See also: #13476 (comment)

This task includes:

• Update the parser to accept the syntax
• Update import analysis in the GUI (if necessary)
• Add support for the syntax to translation

I haven't verified that IR already allows this combination, which could require some additional work in the compiler (outside the scope of this task).