makes generated imports look more normal

[dimitropoulos]

The rationale for this change is that we should take the opportunity, when it arises, to make generated code look natural and typical (if possible). While this isn't a logical change, it's hopefully worthwhile in the pursuit of making the generated outputs feel more normal.

Here's an example:

- import {Message, proto3} from "@bufbuild/protobuf";
+ import { Message, proto3 } from "@bufbuild/protobuf";

Note that this falls in line with Prettier's default as well. In fact, that's how I found it. I was generating code and trying to aim for a final output that matched prettier's default formatting and this was the only thing that I wasn't able to make match as a downstream consumer of protobuf-es.

[dimitropoulos]

closing in favor of #298 so I can switch from the remote to here