Add filtering by category and search to M3U playlist API

[VuzzyM]

• Added filtering support for category query parameter

http://localhost:8090/playlistall/all.m3u?category=movie
http://localhost:8090/playlistall/all.m3u?category=tv
http://localhost:8090/playlistall/all.m3u?category=music
http://localhost:8090/playlistall/all.m3u?category=other
http://localhost:8090/playlistall/all.m3u?category=uncategorized

• Added filtering support for search query parameter

http://localhost:8090/playlistall/all.m3u?search=