Add emission due to CX with neutral hydrogen to the TotalRadiatedPower model #394

Job	Run time
Run tests (oldest-supported-numpy, 3.7)	5m 4s
Run tests (oldest-supported-numpy, 3.8)	4m 56s
Run tests (oldest-supported-numpy, 3.9)	5m 6s
Run tests (oldest-supported-numpy, 3.10)	4m 51s
Run tests ('numpy<2', 3.7)	5m 29s
Run tests ('numpy<2', 3.8)	4m 51s
Run tests ('numpy<2', 3.9)	4m 52s
Run tests ('numpy<2', 3.10)	4m 58s
	40m 7s

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