Symmetrizer to grid
Description
The symmetrizer is now a part of the grid object. The grid object now knows how to symmetrize scalar and vector fields. This avoids reinitializing the symmetrizer object many time, which is expensive.
News snippet
Code refactoring.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.