Refine decision event logic

[lihuoran]

Description

• Add DecisionEventPayload and ActionPayload as the base class for payloads of decision events & action events.
• Add related type check during running.
• Rename related variables under simulator/.
• Refine the action handling logic. Modify Env and related BEs.

Linked issue(s)/Pull request(s)

• issue_number

Type of Change

• Non-breaking bug fix
• Breaking bug fix
• New feature
• Test
• Doc update
• Docker update

Related Component

• Simulation toolkit
• RL toolkit
• Distributed toolkit

Has Been Tested

• OS:
  • Windows
  • Mac OS
  • Linux
• Python version:
  • 3.7
  • 3.8
  • 3.9
• Key information snapshot(s):

Needs Follow Up Actions

• New release package
• New docker image

Checklist

• Add/update the related comments
• Add/update the related tests
• Add/update the related documentations
• Update the dependent downstream modules usage

[codecov]

Codecov Report

Merging #559 (f96c4d2) into v0.3 (8022cd9) will increase coverage by 0.40%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##             v0.3     #559      +/-   ##
==========================================
+ Coverage   78.90%   79.30%   +0.40%     
==========================================
  Files          85       86       +1     
  Lines        5455     5464       +9     
==========================================
+ Hits         4304     4333      +29     
+ Misses       1151     1131      -20     

Flag	Coverage Δ
unittests	79.30% <84.21%> (+0.40%)	⬆️

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

Impacted Files	Coverage Δ
...o/simulator/scenarios/citi_bike/business_engine.py	75.00% <42.85%> (ø)
maro/simulator/core.py	85.40% <68.75%> (-0.73%)	⬇️
...mulator/scenarios/vm_scheduling/business_engine.py	78.72% <90.00%> (+0.09%)	⬆️
maro/common.py	100.00% <100.00%> (ø)
maro/event_buffer/event_buffer.py	100.00% <100.00%> (ø)
maro/simulator/scenarios/cim/business_engine.py	93.63% <100.00%> (-0.02%)	⬇️
maro/simulator/scenarios/cim/common.py	96.49% <100.00%> (+1.84%)	⬆️
maro/simulator/scenarios/citi_bike/common.py	65.45% <100.00%> (+0.63%)	⬆️
maro/simulator/scenarios/vm_scheduling/common.py	82.60% <100.00%> (+0.38%)	⬆️
maro/simulator/utils/common.py	88.88% <100.00%> (-1.59%)	⬇️
... and 3 more

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