Added events, state and event handlers.

[s3rius]

Signed-off-by: Pavel Kirilin win10@list.ru

[codecov-commenter]

Codecov Report

Merging #51 (fe7fde8) into release/0.1.2 (bcc9d9e) will increase coverage by 1.19%.
The diff coverage is 69.52%.

@@                Coverage Diff                @@
##           release/0.1.2      #51      +/-   ##
=================================================
+ Coverage          58.01%   59.21%   +1.19%     
=================================================
  Files                 48       51       +3     
  Lines               1241     1319      +78     
=================================================
+ Hits                 720      781      +61     
- Misses               521      538      +17     

Impacted Files	Coverage Δ
taskiq/abc/middleware.py	100.00% <ø> (ø)
taskiq/abc/schedule_source.py	100.00% <ø> (+10.00%)	⬆️
taskiq/decor.py	74.28% <ø> (+1.31%)	⬆️
taskiq/kicker.py	41.02% <ø> (-0.23%)	⬇️
taskiq/scheduler/merge_functions.py	30.00% <ø> (-3.34%)	⬇️
taskiq/scheduler/scheduler.py	73.68% <ø> (+2.25%)	⬆️
taskiq/task.py	72.72% <ø> (+2.51%)	⬆️
taskiq/brokers/inmemory_broker.py	64.00% <40.00%> (-6.00%)	⬇️
taskiq/abc/broker.py	75.00% <43.75%> (-7.20%)	⬇️
taskiq/state.py	68.18% <68.18%> (ø)
... and 12 more

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