Nanobind port: Order module

[janbridley]

Description

Work toward converting the code to nano bind. Currently, the freud/order/nematic has been 100% translated (with tests passing). @seoulfood has been working to convert the other modules and will reintegrate soon.

TODOs:

• Nematic
• ContinuousCoordination
• Cubatic
• Hexatic
• Steinhardt
• RotationalAutocorrelation
• SolidLiquid (blocked by clusters module)

How Has This Been Tested?

No tests have been modified to ensure the user-facing behavior remains constant. Tests for Nematic now pass.

Screenshots

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds or improves functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation improvement (updates to user guides, docstrings, or developer docs)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• All new and existing tests passed.
• I have updated the credits.
• I have updated the Changelog.