Add init file to opm keyword directory

[larsevj]

This avoids the opmkeyword folder being treated as a namespace package which does not mix very well with komodoenv and editable installs...

Issue still persists, but I still think this is more correct.

[larsevj]

Questions regarding the runmetoupdate.sh script in opmkeywords:

• This does currently not work since the paths have changed in opm-common, should this be fixed? Does the schemas need to be updated, new keywords added?
• Should this script at best be moved to another place? Feels unnatural to include in the package.

[berland]

• This does currently not work since the paths have changed in opm-common, should this be fixed?

yes!

[larsevj]

• This does currently not work since the paths have changed in opm-common, should this be fixed?

yes!

Have created a separate pr for fixing up the opmkeywords.

[Copilot]

Pull Request Overview

This PR adds an __init__.py file to the opmkeywords directory and modernizes resource loading by replacing Path(__file__).parent with importlib.resources.files(). This change addresses packaging issues where the opmkeywords folder was being treated as a namespace package, which can cause problems with komodoenv and editable installs.

• Replace direct file path construction with importlib.resources for accessing package data files
• Update resource loading for both OPM keywords and SVG color names

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[alifbe]

Looks good to me 👍