Data serialisation stability tests: PureScript deserialising golden test files generated by Haskell

[szg251]

Description

We should test both on-chain and off-chain serialisation functions, ensuring that they're consistent.
We also must ensure that data representations directly observed by the Bridge do not change.

This test suite will ensure the following for all data types:

• golden test files generated by Haskell can be deserialised by PureScript, and give back the same data

Related issues/PRs

https://github.com/mlabs-haskell/trustless-sidechain/pull/505