Add one module per source package best practice

Richard Hansenrequested to merge
rhansen/go-team.pages.debian.net:one-per-source-package into master

Encourage maintainers to only package a single Go module per Debian source package, and include rationale.

This is split off of !11 (merged) so that the less controversial parts of !11 (merged) can be merged while we continue to discuss this more controversial change.

cc @zhsj

Edited by Richard Hansen

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