feat: add optional suffix to static builder

[RichardTree]

Not sure what you think of this, my team are coming from using Immutables heavily and are fond of their FieldName.of() syntax convention for static builders.

I’m assuming my change would enable us to call a static builder like FieldNameBuilder.FieldNameOf().

When statically imported, would read succinctly as FieldNameOf()

[Randgalt]

Thanks for the PR - I'll look at this soon.

[codefish1]

Suggested change

	var builder = MethodSpec.methodBuilder(recordClassType.name() + metaData.staticBuilderSuffix())
	var staticBuilderName = Optional.of(metaData.staticBuilderSuffix()).filter(e -> !e.isEmpty()).map(e -> lowerCaseFirstLetter(recordClassType.name())+ e).orElse(recordClassType.name());
	var builder = MethodSpec.methodBuilder(staticBuilderName)

   private String lowerCaseFirstLetter(String value) {
        return value.substring(0,1).toLowerCase() + value.substring(1);
    }

Might be nicer to lowercase the first letter of the static builder as well so instead of FirstnameOf you have firstnameOf for example

[Randgalt]

My initial reaction is that RecordBuilder is getting too many options. We've already had some incompatible ones. We may need to re-think the customization scheme.