Could we make plugin setup suspending?

[baconz]

Is your feature request related to a problem? Please describe.
We would like to do async work in the setup of our plugin. The work needs to block the plugin firing.

Describe the solution you'd like
We would like for setup on the plugin to be suspending.

Describe alternatives you've considered
We could also make the execute itself suspending, but it feels cleaner to make the setup suspending.