x/tools/cmd/goimports: Provide equivalent of "gofmt -s"

[rata]

gofmt provides -s to simplify code. It would be great if goimports can provide that too, as some projects like Kubernetes are using gofmt -s on CI and catching some things I can't catch locally using goimports.

[seankhliao]

This is out of scope for goimports, it's not intended to grow the features of other tools.

[rata]

I guess you are aware, but the documentation says:

In addition to fixing imports, goimports also formats your code in the same style as gofmt so it can be used as a replacement for your editor's gofmt-on-save hook.

It is hard to replace a tool if not all the functionality is provided. But fair, if the goal it is not to provide that.