Required parameters as part of builder constructor

[tobrun]

This is a feature request to add an option to the annotation to generate a builder pattern that requires its required parameters to be passed in through the builder constructor.

@DataCompat(reqParamConstructor=true)
private data class FooBarData(
  private val foo:String,
  private val fooOptional:String?
  private val fooDefault:String = "bar"
)

This will result in:

Foo("foo"){
   fooOptional = "optional"
   fooDefault = "bar2"
}

or on the java side:

FooBar.Builder("foo")
   .setFooOptional("optional")
   .setFooDefault("bar2")

cc @LukasPaczos

[RingerJK]

fooDefault is provided by default so

Foo("foo"){
   fooOptional = "optional"
}

and

FooBar.Builder("foo")
   .setFooOptional("optional")

should work and fooDefault is assign under the hood to "bar"