Track at the fragment level using load information

The PSDK provides QoS information about downloaded fragments and tracks. All the QoS information related to resources that are downloaded is exposed through the LoadInfo class.

1. Implement the onLoadInfo callback event listener.
2. Register the event listener, which the PSDK calls every time a fragment has downloaded.
3. Read the data of interest from the LoadInfo parameter passed to the callback.

   Property	Type	Description
   downloadDuration	long	The duration of the download in milliseconds.
   mediaDuration	long	The media duration of the downloaded fragments in milliseconds.
   periodIndex	int	The timeline period index associated with the downloaded resource.
   size	long	The size of the downloaded resource in bytes.
   trackIndex	int	The index of the corresponding track, if known; otherwise, 0.
   trackName	String	The name of the corresponding track, if known; otherwise, null.
   trackType	String	The type of the corresponding track, if known; otherwise, null.
   type		The type of the download : MANIFEST - indicates that the PSDK downloaded a playlist/manifest FRAGMENT - indicates that the PSDK downloaded a fragment TRACK - indicates that the PSDK downloaded a fragment associated with a specific track
   url	String	The URL pointing to the downloaded resource.

   Note:

   The PSDK does not differentiate between the time it took the client to connect to the server and the time it took to download the full fragment. For example, the PSDK provides information that a 10 MB segment took 8 seconds to download, but does not identify that it took 4 seconds until the first byte and another 4 seconds to download the entire fragment.