* Refactor out the `InterpreterDataEnvelope`
It is an envelope for the data that makes `version` info accessible in
standard non-changing way. Inner data in `InterpreterDataEnv` is a binary blob.
* Use `rkyv` for `InterpreterData`
* `InterpreterDataEnvelope` uses MsgPack directly
It will be changed when `interpreter-sede` will support types with serde borrows.
* Hide `Rc` inside `CID` type, making it cheap to clone.
* Introduce `CidRef` type that abstracts on `CID`'s inner type.
This change makes code cleaner, makes memory more optimal (single allocation vs two allocations) and makes it easier to change CID's internal representation from string to binary.
