Fronius Gen24/ Huawei Sun2000: add max charge power/rate (#17691) #238

Job	Run time
call-build-workflow / Clean	2m 15s
call-build-workflow / Build	1m 31s
call-build-workflow / Lint	2m 19s
call-build-workflow / Test	2m 17s
call-build-workflow / UI	46s
call-build-workflow / Integration	4m 26s
Github & APT	8m 30s
Publish Docker :release	6m 24s
Demo	42s
Hassio Addon	4s
	29m 14s

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