Support eclipse volumes in VolumetricAnalysis

[tnatt]

Up until now the VolumetricAnalysis plugin has only supported static input. This PR fixes that issue.

The PR includes:

• Automatic detection of what fluid_type the different volumetric files are (static vs dynamic)
  • if only dynamic files are given as input, no processing is performed in the InplaceVolumesModel (e.g. removal of column fluid suffixes and computation of properties from the volumetric data)
• Validation of the static volume files as they must fit a strict format to be fit for the input processing done in the InplaceVolumesModel.
• Utilization of the FipMapper from fmu.tools for creating sets of FIPNUM's and REGION∕ZONE's that are comparable
  in volumes, and combining volumes per set. To trigger this behaviour a fipfile with FIPNUM to REGION∕ZONE mapping information needs to be provided.

Also included in the PR:

• Support for giving more than one csv as input to the different volumetric sources (files under each source are merged on common columns).

volfiles:
    geogrid:
        - geogrid_oil.csv
        - geogrid_gas.csv

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Contributor checklist

• 🎉 This PR closes #ISSUE_NUMBER.
• 📜 I have broken down my PR into the following tasks:
  • Task 1
  • Task 2
• 🤖 I have added tests, or extended existing tests, to cover any new features or bugs fixed in this PR.
• 📖 I have considered adding a new entry in CHANGELOG.md, and added it if should be communicated there.

[anders-kiaer]

Nice, I'm not able to find much to comment on 👍