PR: Add *ColorChecker SG* chromaticity coordinates.

[KelSolaar]

Summary

This PR adds the ColorChecker SG chromaticity coordinates with the colour.CCS_COLOURCHECKERS["ColorCheckerSG - Before November 2014"] and colour.CCS_COLOURCHECKERS["ColorCheckerSG - After November 2014"] attribute keys:

ColorCheckerSG - Before November 2014

ColorCheckerSG - After November 2014

We also have them in colour-datasets but it is convenient to ship them directly with colour.

Preflight

Code Style and Quality

• [x] Unit tests have been implemented and passed.
• [x] Pyright static checking has been run and passed.
• [x] Pre-commit hooks have been run and passed.
• [N/A] New transformations have been added to the Automatic Colour Conversion Graph.
• [N/A] New transformations have been exported to the relevant namespaces, e.g. colour, colour.models.

Documentation

• [N/A] New features are documented along with examples if relevant.
• [x] The documentation is Sphinx and numpydoc compliant.

[coveralls]

coverage: 99.733% (+0.003%) from 99.73% when pulling 553a005f16ad0471e3d67f62b55544e6cf45e656 on feature/colorchecker_sg into 0d8982c9b5ce4344915f1daaec6aa795af79452a on develop.

[KelSolaar]

Will fix broken test in subsequent PR.