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>