feat(core): add app.addSetup
for asynchronous configuration steps
#2510
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Connected to #2500 and contains small fixes from #1611.
Adds
app.addSetup()
which allows adding asynchronous configuration/initialization steps.Those will run with services setups during
app.setup()
call.Services use this method to add their own setup calls to queue,
so one can add a step that runs before or after a specific service setup.
This is for cases when you don't have an appropriate service to implement
setup
method in.Will add tests if that sounds as a reasonable addition.