[FEAT] ext.Task.create should work on Scale methods

[artem30801]

Is your feature request related to a problem? Please describe.
I'm always frustrated when ext.Task.create(...) doesn't work on methods in Scales

Describe the solution you'd like
ext.Task.create(...) works on methods in Scales

Describe alternatives you've considered
Register scale methods as tasks out of the class (in setup function). It's ugly.

Additional information
Polls pls

[LordOfPolls]

As per #contributors. Start your tasks in on_startup rather than __init__. This will however, be fixed