chifra docs - undocumented types

[tjayrush]

There are at least six types that are not documented.

StorageSlot, AppRecord, AddrRecord, and Reward

These are "internal" fields for things that were created only because I'm lazy and I did not create a .toml and .csv file.

I don't think there are any others.

There are two undocumented aliases:

type ChunkManifest = Manifest
type ChunkAppearance = Appearance