WIP: Use vector calls in eospac interpolation.

[dholladay00]

PR Summary

@Yurlungur would this be enough to get you started on this? There is a question about masking, and one may want to use less memory which is easily doable.

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the make format command after configuring with cmake.
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• After creating a pull request, note it in the CHANGELOG.md file