Replace TableMultiVariableLookup with TableLookup in model_add_curve

[JanghyunJK]

Pull request overview

• Coming from EUSS cycle 3 upgrade measure work
• This is related to OS 3.7.0
• Since it looks like TableMultiVariableLookup class is deprecated in 3.7.0
• So changing that to TableLookup class
• It'd be great if I could get a review on this here as well; @mdahlhausen
• Now that I think of, I guess backward-compatibility should be added rather than my complete replacement
• I'm testing that modified part with my HP RTU upgrade measure but unsure what would be best for testing for here

Pull Request Author

• Method changes or additions
• Data changes or additions
• Added tests for added methods
• All new and existing tests passes

Review Checklist

• Perform a code review on GitHub
• All related changes have been implemented: method additions, changes, tests
• Check rubocop errors
• Check yard doc errors
• If fixing a defect, verify by running develop branch and reproducing defect, then running PR and reproducing fix
• If a new feature, test the new feature and try creative ways to break it
• CI status: all green or justified

[mdahlhausen]

@JanghyunJK I made a few changes

• generalized existing curve lookup
• added a switch statement to support different OS versions
• added a test

I'll merge after it runs through the CI