Add support for Stepuptech solar inverter SG800

[sj29fr]

Hello, I added support for Stepuptech solar inverter bought from Materfrance. I removed the CO2 and plant tree indicators. I also don't know how to handle clear energy function. Nevertheless, it provides all required statistics. For info, the tuya protocol version is 3.5.

[sj29fr]

Hi @make-all I am not sure about the 'force' option. Indeed my inverter seems to be defective. I need to wait for a new one to continue this commit.

[make-all]

If force is needed, it is needed. My comment was just to make sure you have checked first that it is needed (ie those dps are not returned by default, and adding force: true is effective to make the device return them). Otherwise it can cause problems of its own. But one thing with force: if force: true is needed, then I expect optional: true to also be needed for those dps, since the reason they need to be forced is that they are not normally reported by the device.