feat: Allow using events on callbacks

[fgmacedo]

Allows the usage of events on callbacks.

    class ChainedSM(StateMachine):
        a = State(initial=True)
        b = State()
        c = State()

        t1 = a.to(b, after="t1") | b.to(c)

Closes: #351

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (37fd275) compared to base (9a64f4b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #355   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          867       894   +27     
  Branches       142       148    +6     
=========================================
+ Hits           867       894   +27     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
statemachine/dispatcher.py	100.00% <100.00%> (ø)
statemachine/event.py	100.00% <100.00%> (ø)
statemachine/event_data.py	100.00% <100.00%> (ø)
statemachine/statemachine.py	100.00% <100.00%> (ø)
statemachine/transition.py	100.00% <100.00%> (ø)

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[fgmacedo]

Note: This tip saved the day: tiangolo/typer#371 (comment)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication