Put the generated files .pb.go and .connect.go in the same package

[lbensaad]

Is your feature request related to a problem? Please describe.
For protoc-gen-connect-go, the generated files file.pb.go and file.connect.go are put in two separate packages and in two separate folders, it is very troublesome to import more packages and against simplification

Describe the solution you'd like
Both file.pb.go and file.connect.go are generated from the same .proto file so they should be put in the same folder and in the same package this is defined in the .proto file.

[mattrobenolt]

This is documented why this decision was made. https://connect.build/docs/faq#why-generate-connect-specific-packages

[akshayjshah]

As Matt mentioned, we explain this in the FAQ. Beyond just our preferences, we're not going to change the default behavior now that we've released a 1.0.

I'm going to convert this to a discussion. If enough people are interested in this, I'm open to adding an option to protoc-gen-connect-go.

[akshayjshah]

Whoops, this is already open as https://github.com/bufbuild/connect-go/discussions/310. @lbensaad, please upvote that discussion!