* Added in tetgen background mesh resizing functionality

* Pass in bgmeshfilename to enable to enable mesh resizing
* Pass in bgmesh pyvista object to enable mesh resizing
* Examples of usage and testing

* Update code review commits

- Remove deduplication of tets
- Remove resorting of vertices order of tets
- Added verbose printing of bgmin object
- Moved mtr handling out of LoadArray
- Added some temporary debugging lines in test_tetgen.py

* some cleanups

* ifixedit

* address review

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Co-authored-by: Dion Häfner <dion.haefner@simulation.science>

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