Add Validation

[BoySanic]

After a result is submitted, we should be validating the content of the result.

This can happen either by quorum (all results produced the same output from multiple machines) or by some smarter/cheaper method of proving a result to be correct, if such is possible.

[BoySanic]

Validator crate
Results validated individually - check for exit code 0 and maybe some logic to check if the task failed or not

Results validated with multiple results - check for quorum

Canonical result id in tasks - if there's a canonical result the validator should not grab that task for validation.

If result count > quorum, attempt validation

Maybe a object in memory is calculated at startup for the server, and a route can return the tasks awaiting validation from there?

Or we can add a table to the db that contains only task ids that need validation, and the validator hits an endpoint to grab those, and can grab results using those to attempt validation