Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

…#2388)

## Description

This PR refactors the core logic of the engine task handler. In
particular, it moves duplicate code from the build and the insert unsafe
tasks to the forkchoice task.

Changes:
- Add an associated `Output` type for the `EngineTaskExt` trait which
allows the implementors of this trait to be composed. In particular, the
`ForkchoiceTask` may returns the payload id that was inserted in the EL,
which can be used by the `BuildTask` to consolidate the payload into the
engine state.
- Allows the `ForkchoiceTask` to directly insert newly built payload
attributes into the EL (by adding an `Option<OpAttributeWithParent>`
argument to the `ForkchoiceTask`). This allows to refactors both calls
to the `FCU` inside the `BuildTask` using the `ForkchoiceTask` and
avoids manually handling the forkchoice updates
- Moves the `PayloadStatus` verification logic to the `ForkchoiceTask`
to avoid having to perform the same logic in both the `BuildTask` and
the `InsertUnsafeTask`, which allows to fix the sequencer kickstart
issue described in #2372

Close #2372 

## Potential follow-ups

- Remove the clones inside the engine tasks
- Refactor the `new_payload` logic into an engine task to remove
duplicate code in the `InsertUnsafe` and `Build`Tasks

…nchronize task. move block building logic to build task (#2524)

## Description

Attempt at cleaning-up the engine and restoring the behavior from
pre-refactor https://github.com/op-rs/kona/pull/2388/files.
In particular:
- Split up the forkchoice task into separated build and synchronize
logic. The synchronize logic is now closer to the pre #2388 state
- Restore the build FCU method in the build task. Ensure that the
side-effects match the pre-#2388 state
- Audit the other tasks and ensure the composition (if any), follow the
side-effects from #2388
- Remove the `Forkchoice` task from the `EngineTask`s.

…nchronize task. move block building logic to build task (op-rs/kona#2524)

## Description

Attempt at cleaning-up the engine and restoring the behavior from
pre-refactor https://github.com/op-rs/kona/pull/2388/files.
In particular:
- Split up the forkchoice task into separated build and synchronize
logic. The synchronize logic is now closer to the pre op-rs/kona#2388 state
- Restore the build FCU method in the build task. Ensure that the
side-effects match the pre-#2388 state
- Audit the other tasks and ensure the composition (if any), follow the
side-effects from op-rs/kona#2388
- Remove the `Forkchoice` task from the `EngineTask`s.

…nchronize task. move block building logic to build task (op-rs/kona#2524)

## Description

Attempt at cleaning-up the engine and restoring the behavior from
pre-refactor https://github.com/op-rs/kona/pull/2388/files.
In particular:
- Split up the forkchoice task into separated build and synchronize
logic. The synchronize logic is now closer to the pre #2388 state
- Restore the build FCU method in the build task. Ensure that the
side-effects match the pre-#2388 state
- Audit the other tasks and ensure the composition (if any), follow the
side-effects from #2388
- Remove the `Forkchoice` task from the `EngineTask`s.