Replace parachain/parathread boolean by enum (#6198)

* Replace parachain/parathread boolean by enum

* Address PR comments

* Update dependencies

* ParaType -> ParaKind

* Swap enum field order to avoid migration

* Rename paratype field to parakind

* Manual en-/decocing of Parakind

* Manual TypeInfo for ParaKind

* rename field back to parachain

* minor

* Update runtime/parachains/src/paras/mod.rs

Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

* Manual serde Serialize and Deserialize for ParaKind

* cargo fmt

* Update runtime/parachains/src/paras/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Add test for serde_json encoding/decoding

* Move serde_json dep to dev-deps

Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>
Co-authored-by: Andronik <write@reusable.software>

polkadot/runtime/parachains/src/builder.rs

@@ -16,6 +16,7 @@
 
 use crate::{
 	configuration, inclusion, initializer, paras,
+	paras::ParaKind,
 	paras_inherent::{self},
 	scheduler, session_info, shared,
 };
@@ -345,7 +346,7 @@ impl<T: paras_inherent::Config> BenchBuilder<T> {
 				paras::ParaGenesisArgs {
 					genesis_head: Self::mock_head_data(),
 					validation_code: mock_validation_code(),
-					parachain: true,
+					para_kind: ParaKind::Parachain,
 				},
 			)
 			.unwrap();