Import a neighboring direct-file module

Canonical source: protos/examples/modules/direct-file-import/main.protos at locked revision e99b712ecf658a527b1fe82c8beba2c1286d8dc9.

This executable example is rendered from the exact Protos source consumed by the website. Its program body is copied without modification.

Helper: import("./helper.protos")

print(Helper.greeting)