[GnoVM] Suggest gno mod tidy for unknown import

[leohhhn]

Description

Quite often I see people with unknown import errors. It would be great if upon this error we can suggest running a gno mod tidy, as this will fix a good part of these issues.

cc @gfanton

[github-actions]

This issue is stale because it has been open 6 months with no activity. Remove stale label or comment or this will be closed in 3 months.

[thehowl]

Closing, as we're removing require (and needing tidy) instead: #3123