Convert Description to a record class

[Isira-Seneviratne]

• Converted the Description value class to a record for conciseness.
• Added a static of method to avoid redundant object creation for empty descriptions.
• Added a Type enum for type safety.

Breaking

Increases the target and source compatibility java version from 11 to 17.

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• 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.

[absurdlylongusername]

If we are intending to convert the extractor to Kotlin in the near future, I don't think refactors such as this will hold much value as they will end up being redundant.

[Isira-Seneviratne]

Records have some optimizations: https://android-developers.googleblog.com/2023/06/records-in-android-studio-flamingo.html

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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

[TobiGr]

Thank you. While you are at it, please add a SPDX license header to Description as well as JDoc. I have added the bump of the target and compatibility version to the description. That's a breaking change which should be visible.