Add pov-export to slot-based collator

[skunert]

In the lookahead collator we have support for the --export-pov-path CLI arg. For some debugging scenarios, this will export PoVs that are send to the relay chain to the local file system.

polkadot-sdk/cumulus/client/consensus/aura/src/collators/lookahead.rs

Line 444 in 3b2a1db

if let Some(ref export_pov) = export_pov {

The slot-based collator does not currently support this, so we should add it.

Needs to be added to the params:

polkadot-sdk/substrate/client/service/src/builder.rs

Line 359 in 1866c3b

pub struct SpawnTasksParams<'a, TBl: BlockT, TCl, TExPool, TRpc, Backend> {

Then we need to export it in the collation-task:

polkadot-sdk/cumulus/client/consensus/aura/src/collators/slot_based/collation_task.rs

Line 150 in 1866c3b

tracing::debug!(target: LOG_TARGET, ?core_index, %hash, %number, "Submitting collation for core.");

[MrishoLukamba]

taking it @skunert

[MrishoLukamba]

In the lookahead collator we have support for the --export-pov-path CLI arg. For some debugging scenarios, this will export PoVs that are send to the relay chain to the local file system.

polkadot-sdk/cumulus/client/consensus/aura/src/collators/lookahead.rs

Line 444 in 3b2a1db

if let Some(ref export_pov) = export_pov {
The slot-based collator does not currently support this, so we should add it.

Needs to be added to the params:

polkadot-sdk/substrate/client/service/src/builder.rs

Line 359 in 1866c3b

pub struct SpawnTasksParams<'a, TBl: BlockT, TCl, TExPool, TRpc, Backend> {
Then we need to export it in the collation-task:

polkadot-sdk/cumulus/client/consensus/aura/src/collators/slot_based/collation_task.rs

Line 150 in 1866c3b

tracing::debug!(target: LOG_TARGET, ?core_index, %hash, %number, "Submitting collation for core.");

I do not think the params for exporting should be set inside SpawnTaskParams as that it is in substrate client and not cumulus client and the context is POV.
Opening a PR soon to see what I have done