IDE-295 Refactor SoundRecorder files to Kotlin

[herbsee02]

Refactored the files org.catrobat.catroid.soundrecorder.RecordButton, org.catrobat.catroid.soundrecorder.SoundRecorder, and org.catrobat.catroid.soundrecorder.SoundRecorderActivity from Java to Kotlin. Created a Unit-Test for SoundRecorder in addition to existing Integration-Tests. Added Dependency for MockK and used it to fix the test in org.catrobat.catroid.test.formulaeditor.SensorHandlerTest.

https://catrobat.atlassian.net/browse/IDE-295

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[sonarqubecloud]

Quality Gate passed

Issues
0 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

[Frajhamster]

Looks great!