Release rgb_decomp docs, hyp3v2 helpers, and watermask bugfix

[jhkennedy]

Developer checklist

• [x] Assigned a reviewer

• [X] Indicated the level of changes to this package by affixing one of these labels:

  • ~"major" -- Major changes to the API that may break current workflows
  • ~"minor" -- Minor changes to the API that do not break current workflows
  • ~"patch" -- Patches and bugfixes for the current version that do not break current workflows
  • ~"bumpless" -- Changes to documentation, CI/CD pipelines, etc. that don't affect the software's version

• [x] (If applicable) Updated the dependencies and indicated any downstream changes that are required

• [x] Updated the CHANGELOG.md

• [x] Added/updated documentation for these changes

• [x] Added/updated tests for these changes

Reviewer checklist

• [ ] Are all the Checks passing?
• [x] Have all dependencies been updated and required changes merged downstream?
• [x] Is the level of changes labeled appropriately?
• [x] Are all the changes described appropriately in the changelog?
• [ ] Has the documentation been adequately updated?
• [x] Are the test adequate?