[YouTube] Set EU consent cookie

[TobiGr]

• I carefully read the contribution guidelines and agree to them.
• I have tested the API against NewPipe.
• I agree to create a pull request for NewPipe as soon as possible to make it compatible with the changed API.

Addresses #592

[Redirion]

lgtm

[TobiGr]

I just pushed the same commit again to trigger the CI. GitHub Actions did not run all tests again after changing the target branch to master

[TobiGr]

Ah. what a bummer. The randomized consent cookie makes the mocks useless, because the recorded requests are not equal to the current anymore.
@XiangRongLin Is there a way to change this? I guess, we need to change the equals and hashCode method of Request. I do not have time for this anymore today.

[XiangRongLin]

@TobiGr Instead of directly declaring a random number generator, you can inject one from outside. This way you inject a deterministic one in tests. I'll take a look at it

This is something that can generally be done when trying to avoid randomness in tests. Thats also why Dependency Injection (DI) is so important

[XiangRongLin]

@TobiGr done

org.schabi.newpipe.extractor.services.youtube.stream.YoutubeStreamExtractorDefaultTest.StreamSegmentsTestOstCollection
I can't generate mocks, because the video is blocked in my country

org.schabi.newpipe.extractor.services.youtube.search.YoutubeSearchExtractorTest.Videos
Has test failures in the continuation tests, no idea why and didn't look into it.

[TobiGr]

regarding the two tests: that's why I wanted to set up a weekly mock update. I cannot make the tests complete successfully either. I'll merge this and release 0.21.1 now. We cannot wait any longer

Thank you for fixing the mock tests! This solution looks good to me.

[Redirion]

CONENT_COOKIE constants should be private as only the method generateConsentCookie should be used