Improve async youtube

[joostlek]

Proposed change

According to @MartinHjelmare the async part in the coordinator should be different due to overloading executor. Made this a separate pull request for better discussion.

cc @allenporter

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[MartinHjelmare]

Looks good!

[joostlek]

Looks good!

Oh that was easy haha, expected more problems :)

[allenporter]

Make sense to keep as one sync block given multiple calls to the executor. The main point was not to do multiple serial async blocks and this is even better.