HLS (HTTP Live Streaming) support

[eduardokraus]

This PR adds support for HLS (HTTP Live Streaming) in the H5P video player.
Now, .m3u8 files can be used as a video source, enabling adaptive playback across different bandwidths and devices.

Main changes:

• Added automatic detection of .m3u8 URLs.
• Integrated hls.js for browsers without native HLS support.
• Kept fallback to the HTML5 player when native support is available (e.g., Safari).
• Updated the player initialization logic to handle HLS streams transparently for the user.

What I did:

• The edit was made directly in the original html5.js file of H5P, now rewritten in ES6.
• The validation now only checks for the .m3u8 extension before verifying if the file has native browser support.
• There is no need to modify the AV Widget file, especially because H5P html5 does not have a specific entry for it.
• The tests were performed with both simple and interactive videos, tested standalone as well as inside the Interactive Book resource.
• Although the [h5p.classes.php](https://github.com/h5p/h5p-php-library/blob/1afd89a8bd1df4843dd946a82aaff35d62fdc507/h5p.classes.php#L2108) file contains the list of allowed extensions, everything worked normally during testing.