[YouTube] Rewrite PoToken functionality using coroutines

[Isira-Seneviratne]

What is it?

• [ ] Bugfix (user facing)
• [ ] Feature (user facing)
• [x] Codebase improvement (dev facing)
• [ ] Meta improvement to the project (dev facing)

Description of the changes in your PR

• Rewrite the PoToken functionality to use Kotlin coroutines instead of RxJava.

Fixes the following issue(s)

• Fixes #

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• [x] I read the contribution guidelines.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Profpatsch]

lol there is no way to retract my approval, thank you github. Obviously fix the thing @Stypox mentioned :)

[sonarqubecloud[bot]]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud