Combine RawCodec and Queryable?

What is the benefit of having `RawCodec` in addition to `Queryable`? It has a subset of the functionality, but for every type you'd want to implement `RawCodec` for, you'd also want to implement `Queryable` for. (It's also never used as trait, so if there are exceptions, you could just use a free function as helper)

Start by locating the RawCodec and Queryable trait definitions and searching their implementations and usages across the crate. Compare their responsibilities and usage patterns, then document a decided consolidation or retention approach and update affected APIs and tests accordingly.

Written by the indexing model from the issue text.