LSP automatically should insert required imports when completing

[gak]

eg when there are no imports in the file, and you complete a verb, an import ( "context" ) would be added. Similar to ftl/builtin and "github.com/TBD54566975/ftl/go-runtime/ftl", and correctly appending imports to existing blocks.

I think this is possible with additionalTextEdits.

[alecthomas]

This is a bug and will be solved by #1662. Once that's done, the Go LSP will do the correct thing.