feat: MetaDetails - guess streams only when a flag is present

[elpiel]

This feature allows you to load the MeteDetails without loading streams.
Previous feature allowed the guessing of the streams if a stream_path was not provided - see #474, but there are cases in the apps where we load the MetaDetails but we don't actually want to load the streams as we only show a small modal with just a few things from the MetaDetails like the Trailer.

We now have 4 code cases:

1. stream_path: Some and we have guess_stream: false - loads the stream from the provided path
2. stream_path: Some and guess_stream: true - loads the stream from the provided path ignoring the guess_stream: true
3. stream_path: None and guess_stream: true - guesses the stream_path using the first successfully loaded MetaItem
4. stream_path: None and guess_stream: false - no streams will be loaded for the MetaDetails

[tymmesyde]

Maybe guess_stream true by default since it's the intended behavior ?

[elpiel]

Maybe guess_stream true by default since it's the intended behavior ?

no, it's not. The value true should be taken into account only when stream_path is None