RPC refactor follow-up

[sistemd]

• Remove v06.
• Don't use #[derive(serde::Deserialize)] and #[derive(serde::Serialize)] (except for types that are encoded into JSON strings in responses - CairoContractClass, maybe some others, there are comments indicating where this is the case).
• Remove v02 and move the types into more reasonable locations.
• Revisit deserialize_serde calls (almost all should be removed, except those used for types in point 2 above).
• Move SerializeForVersion into the super module so it can be implemented on common types #2181