Add ACES2065-1 and ACEScg as shading system color spaces

[brechtvl]

Description

Make functions like blackbody and wavelength work with ACES color spaces.

Another approach would be to get this information from OpenColorIO configs that have an aces_interchange and rendering role, but that's more complicated and does not work for all configs. This just adds two entries to the existing list.

Tests

New test added for shading system colorspace attribute.

Checklist:

• I have read the contribution guidelines.
• I have previously submitted a Contributor License Agreement.
• I have updated the documentation, if applicable.
• I have ensured that the change is tested somewhere in the testsuite (adding new test cases if necessary).
• My code follows the prevailing code style of this project.

[AlexMWells]

Nice remembering to add the BATCHED to the colorspace unit test!

[lgritz]

Thanks, @brechtvl !