Add a way to disable tracking

Thanks @prudloff!
I think this is a good idea and I would like to see this feature added to the module too.

Thanks a lot @prudloff for the MR!
I added some stuff there too, like a very simple test and some defaults for settings.

How does it look now? I also tested it myself and the new setting seems to work.

Looks good to me! 👍

Thanks @joonaskokko !
I guess we can go forward with this one soon.

Tried to merge this to 1.4.x but for some reason couldn't find the Merge UI anywhere?
So I merged this from https://git.drupalcode.org/project/piwik_pro/-/merge_requests/23. Let's see how this goes.

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