Improve performance

[coretl]

• Move to a long running task per subscription rather than 1 per update
• Only keep long running task if callback is async
• If callback is sync than execute it in the wakeup function
• Only wakeup asyncio if it isn't already awake

Refs #30

[codecov[bot]]

Codecov Report

Merging #29 (99a881b) into master (6eeffa4) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #29   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         2    -1     
  Lines          407       422   +15     
=========================================
+ Hits           407       422   +15     

Impacted Files	Coverage Δ
aioca/_catools.py	100.00% <100.00%> (ø)
aioca/__init__.py

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