* Use selection for blob certificates
* Fix bin imports
* Fix rebase
* Missing blobs -> certificates refactor
* Fix attestation and certificate as_bytes
* More naming refactors
* Make the data availability service work with multiple protocols
* Add a generic way to instantiate DaProtocol
Add settings type and a new `new(Self::Settings)` method to
build a new DaProtocol instance
* Add data availability service to node
* fix tests
* fix imports
Add an initial simple but functional implementation for a data
availability protocol.
Full replication simply encodes bytes in a single blob which is
replicated in all nodes.
