feat(core): Add async run method on ExperimentalPendingTasks

[atscott]

This helper method is simply a convenience function that reduces some boilerplate with manually adding and removing a task around some asynchronous function.

[thePunderWoman]

reviewed-for: public-api

[AndrewKushnir]

Looks great, thanks @atscott 👍

[AndrewKushnir]

Reviewed-for: public-api

[pkozlowski-opensource]

This PR was merged into the repository by commit 3ebe6b4.

The changes were merged into the following branches: main

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