assemble and send inherent data

[EclesioMeloJunior]

Description

The ProvisionerInherentData struct is composed of: bitfields, candidates, disputes, the unique information that is tracked under provisioner state per relay block is the bitfields.

So we need to collect the other components before sending them, this task can take some time, so we should spawn a goroutine to unblock the provisioner subsystem, placing a timeout so we don't let the goroutine to run forever.

Here is what we should query/compute before sending the inherents

1. Request availability cores
2. Select the disputes
3. Select availability bitfields
4. Select candidates

Links

• https://github.com/paritytech/polkadot-sdk/blob/71c19e4c7ca2b411722ec7d9c1392e1bd81b5681/polkadot/node/core/provisioner/src/lib.rs#L267C10-L267C31

Acceptance Criteria

• Include metrics