Add account config option for grid executors

[pditommaso]

This PR adds the ability to define a Slurm account in the nextflow config. For example:

executor {
  account = 'some-project-xyz'
}

Solve https://github.com/nextflow-io/nextflow/issues/4921

Updated to use executor instead of slurm on 7th May

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[bentsherman]

In this case I recommend also moving executor.perCpuMemAllocation to slurm.perCpuMemAllocation.

[marcodelapierre]

I would suggest exposing this option as a generic executor one, executor.account, rather than creating the new slurm config scope.
Indeed, other executors implement it, e.g. PBS has -P <account/project>.

[muffato]

Hi. I was going to suggest the same thing as @marcodelapierre . LSF has the -G user_group: https://www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=o-g-1

[pditommaso]

Fair enough

[pditommaso]

@bentsherman @marcodelapierre please have a look and let's merge it

[pditommaso]

Thanks both. I've reverted 9486d68 because it's better to keep explicit from the name is coming from