Use API key from YouTube Data API

[akhilerm]

I assume that the API key used to query youtube music is hard coded here. It would be better to have a configurable API key so that any one can use their Youtube Data API key to search music.

[kapasifulop]

This uses YouTube music api v1 which does not require an api key. If you want, you can simply delete the end of the url (&key=...) and it will still work.