Add automatic captcha solver capability, session-reuse and battery support

[Spiritreader]

Hi,

this is the PR we have mentioned in #5.

It will add the following capabilities to the fusion solar client:

• Automatic captcha solving if the API requires captchas on sign-in.
• Option to pass in an existing requests-session, allowing API calls to be performed without logging in again, even if the application that uses the fusion solar client is started multiple times. Expired sessions will be auto-renewed.
• Support for reading data from LUNA2000-based solar battery packs (LG-based systems untested).

In addition, we also provide a captcha_huawei.onnx model that we pre-trained with self-collected data from the huawei captcha service.

In case there are any questions, please ping @FunnyPocketBook or @Spiritreader

[jgriss]

@Spiritreader Thanks a lot! The code looks absolutely great!