[Refactor][Nice to have] rename timeStamp to streamTimeStamp or move to StreamUrlIdHandler

[FlorianSteenbuck]

Its quit confusing if you want to implement a service getTimeStamp is in the context of the StreamExtractor and not the upload date or something like this. It would be better to move this to the StreamUrlIdHandler because its a url parsing part and not something that is in the meta data of the stream, like the most data that is can be accessed over the StreamExtractor

++ extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamUrlIdHandler.java

public interface StreamUrlIdHandler extends UrlIdHandler {
String getTimeStamp(String url) throws ParsingException;
}

or directly in the living standard implementation of url parsing that comes with DTube and MediaCCC support. (Url Parsing get maybe moved to a whole new project)

Relevent for new implementations.
And currently in the DTube Implementation (already fixed local):
Wrong Implementation
|_ Usage of Wrong Implementation
|_ Base Needs to be removed
|_ Base Needs to be removed now

[theScrabi]

Can you please link the relevant code.