Allow custom scalars targets in FakeResolver return types

[martinbonnin]

Previously, compile-time adapters required resolveLeaf to return a Json-like value. This break the symmetry with runtime adapters and is more cumbersome to use.

To allow this, we now generate a customScalarAdapters property that contains all compile-time adapters that we can use to automatically serialize when needed.

Random thoughts: the compile-time vs run-time difference make all this code pretty cumbersome. In the future, we should think of ways to make everything a compile-time thing. Maybe with KSP:

@ApolloAdapter // annotation that will signal the adapter to use
object MyLongAdapter: Adapter<MyLong> {
  override fun fromJson(reader: JsonReader, customScalarAdapters: CustomScalarAdapters): MyLong {
    return MyLong(reader.nextString()!!.toLong())
  }

  override fun toJson(writer: JsonWriter, customScalarAdapters: CustomScalarAdapters, value: MyLong) {
    writer.value(value.value.toString())
  }
}

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[martinbonnin]

That's the meat of the change

[martinbonnin]

I started adding "TODO v4" for stuff that will need to be reworked. I don't think we had any marker previously?

[BoD]

Good idea!
(I don't think we did)

[BoD]

Very cool! 👍