feat: add cs=origin

[arno-fukuda]

Description

Adding new cs=source to colorspace param.

Checklist

• [x] Read the contributing guidelines.
• [x] Each commit follows the Conventional Commit spec format.
• [x] Update the readme (if applicable).
• [x] Update or add any necessary API documentation (if applicable)
• [x] All existing unit tests are still passing (if applicable).

• [x] Add some steps so we can test your bug fix or feature (if applicable).
• [x] Add new passing unit tests to cover the code introduced by your PR (if applicable).
• [x] Any breaking changes are specified on the commit on which they are introduced with BREAKING CHANGE in the body of the commit.
• [x] If this is a big feature with breaking changes, consider opening an issue to discuss first. This is completely up to you, but please keep in mind that your PR might not be accepted.