* WIP: Direct DA connection protocol
* Dispersal wrapper messages for executor to node communication
* Reusable types in dispersal.proto
* Add helper methods for dispersal errors
* Remove redundant BlobId type
* Write to connections in parallel
* Explicite package name for dispersal proto messages
* Parse length+message in the proto module
* Move dispersal proto into subnets poc
* Test for protocol message helper functions
* Use dispersal proto message in poc executor