Rework execution to allow preconfirmations (#2799)

## Linked Issues/PRs

## Description

### DONE:
- Move the executor trait in correct modules to correctly use ports and
adapters
- Makes the produce function async and add a trigger as parameter.
- Pass channel of preconfirmations to the executor
- Added a new production mode for PoA service. The open production mode
starts the block production immediately and finishes after the `period`
is passed.

## Checklist
- [x] Breaking changes are clearly marked as such in the PR description
and changelog
- [x] New behavior is reflected in tests
- [x] [The specification](https://github.com/FuelLabs/fuel-specs/)
matches the implemented behavior (link update PR if changes are needed)

### Before requesting review
- [x] I have reviewed the code myself
- [x] I have created follow-up issues caused by this PR and linked them
here

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Co-authored-by: Mitch Turner <james.mitchell.turner@gmail.com>
Co-authored-by: Green Baneling <XgreenX9999@gmail.com>