Tracking issue for RFC 59: Get rid of upwards propagation of clock domains

[wanda-phi]

• RFC PR: Add an RFC for removing upwards propagation of clock domains rfcs#59
• Implementation PR (0.5): Implement RFC 59: Get rid of upwards propagation of clock domains #1259
• Implementation PR (0.6): Implement RFC 59: Get rid of upwards propagation of clock domains. #1397
• Implementation PR (0.7): TODO