Avoid creating tasks for starting/finishing the connection

[bdraco]

We end up creating a lot of tasks when the device is in deep sleep since its trying to reconnect. We can replace them with async_interrupt and futures. This simplifies the connection process and reduces the chance for races.

This also speeds up connections because we don't end up with 3 tasks to make a connection anymore, only 1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (41eeabc) 100.00% compared to head (d2b0087) 100.00%.
Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main      #826   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           17        17           
  Lines         2433      2434    +1     
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+ Hits          2433      2434    +1     

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