At the moment per-account asset reads 1 are inefficient, because they:

1. read all keys by prefix
2. issue one state-read per key.

They are also inflexible as surfaced in PR #1408 because they don't allow the call site to decide how the returned items should be processed.

The per-account asset reads should be implemented in terms of a stream using the cnidarium::Read::prefix_raw [2] to make the reads more efficient and flexible.

┆Issue Number: ENG-791