Implement all types that doesn't require any external dependencies. - [types.go](https://github.com/ObolNetwork/charon/blob/b3008103c5429b031b63518195f4c49db4e9a68d/core/types.go) - [core](https://github.com/ObolNetwork/charon/blob/ffc9dcd1c2133c9f440fceb625ecdf0b251cdf2a/core)
Implement all types that doesn't require any external dependencies.