Add raw code to generated file

[jmattheis]

Sometimes you want to add some generic code, but only after the generator ran. E.g. when you want to have a variable that has an initialized converter impl.

var Converter Converter = &ConverterImpl{}

Having this inside the conversion interface will cause compile errors. This issue proposes a new setting called goverter:output:raw where you can define raw code that will be added to the generation file.

Example:

// goverter:converter
// goverter:output:file ./output.gen.go
// goverter:output:raw func init() {
// goverter:output:raw     converter = &converterImpl{}
// goverter:output:raw }
type Converter interface {}

Please :+1: this issue if you like this functionality. If you have a specific use-case in mind, feel free to comment it.