fix: added check for collocated points

[rabii-chaarani]

Description

A quick fix to remove and avoid collocated points in interpolation

Fixes #123

Type of change

• [ ] Documentation update
• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Test improvement

How Has This Been Tested?

Tested on Jupyter Notebook using the example provided in issue #123 The interpolator doesn't return exceptions and works as expected

Checklist:

• [X] This branch is up-to-date with master
• [X] All gh-action checks are passing
• [X] I have performed a self-review of my own code
• [X] My code follows the style guidelines of this project
• [X] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] My tests run with pytest from the map2loop folder
• [X] New and existing tests pass locally with my changes

Checklist continued (if PR includes changes to documentation)

• [ ] I have built the documentation locally with make.bat
• [ ] I have built this documentation in docker, following the docker configuration in map2loop/docs
• [X] I have checked my spelling and grammar

[lachlangrose]

Looks ok but would it be worthwhile checking so see if the entries are true duplicates or just collocated? If they are collocated do you want to choose one or average? If they are true duplicates dropping one is ok. I would also alert the user to what has been done by logging a warning.