PR: Implement support for "Canon" v1.2 encodings.

[KelSolaar]

Summary

This PR implements support for Canon v1.2 encodings that define their constants in legal range. Minor numerical differences because of the rounding of the constants are expected.

References #1176.

Preflight

Code Style and Quality

• Unit tests have been implemented and passed.
• Pyright static checking has been run and passed.
• 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

• New features are documented along with examples if relevant.
• The documentation is Sphinx and numpydoc compliant.

[coveralls]

coverage: 99.775% (+0.002%) from 99.773% when pulling 788593e on feature/canon_log_v1.2 into ca0bba3 on develop.