Direct emissions import of Dutch regional emissions.csv from regional data pipeline

[kndehaan]

Context

This PR updates the emissions.csv files to Dutch regional dataset, imported from ETDataset as result of the Dutch regional data pipeline.

Implemented changes

Data pipeline related:

• New data pipeline added for Dutch regional datasets. Emissieregistratie is used as source applies and conversion steps are applied to generate the required CSV format.
• Automatic validation is done in the data pipeline.
• Intermediate emissions.csv are exported for manual checks.
• README added
• Restructering of folders in the tools/emissions folder

Related

Goes with:

• https://github.com/quintel/etdataset/pull/1097
• Direct emissions import of Dutch regional emissions.csv from regional data pipeline #3465
• Remove emissions method availability exception from descriptions etmodel#4763

Checklist

• I have tested these changes
• I have updated documentation as needed
• I have tagged the relevant people for review

[jort-wolda]

Looks good. To be able to run the model locally I had to (locally) rebase with master. I didn't push this but since there were no conflicts it should be fine to merge.

[kndehaan]

Ready for final review by @mabijkerk