* 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
Firstly, a failure in deserialization for a network message is not
an error especially since we're using a public channel.
Secondly, that same channel is shared by different kind of messages
so trying to interpret one as the other will surely lead to a
unsuccessfull attempt.
* Add basic da module and traits
* Pipe new blobs and internal message handling
* Add and pipe send attestation method
* Add blob trait
* Make da backend async
* Implement mocka backend
* Bound blob in da backend to blob trait
* Added remove blob
* Rename reply to attestation
Giacomo Pasini
Daniel Sanchez