feat: get text and html

[kopfrechner]

Add two functions to get the current page content either in plain text or html. So the Client is able to figure out the CSS selectors for further interactions by himsef.

[kopfrechner]

@executeautomation i ported it to the refactored code base :)

[executeautomation]

Perfect, looks great, thanks @kopfrechner !

I will include in the next release for tomorrow 1.0.3

Thanks, Karthik KK