feat(events): extract event information

[glevco]

Acceptance Criteria:

• Implement missing event attributes for EventManager extraction using classes instead of dicts

[codecov]

Codecov Report

Merging #535 (bdfb5a7) into dev (fc19b23) will increase coverage by 0.03%.
The diff coverage is 98.00%.

@@            Coverage Diff             @@
##              dev     #535      +/-   ##
==========================================
+ Coverage   83.15%   83.19%   +0.03%     
==========================================
  Files         209      210       +1     
  Lines       18507    18574      +67     
  Branches     2586     2587       +1     
==========================================
+ Hits        15389    15452      +63     
- Misses       2555     2557       +2     
- Partials      563      565       +2     

Impacted Files	Coverage Δ
hathor/event/model/base_event.py	92.30% <92.30%> (ø)
hathor/event/__init__.py	100.00% <100.00%> (ø)
hathor/event/event_manager.py	97.01% <100.00%> (+2.07%)	⬆️
hathor/event/model/event_data.py	100.00% <100.00%> (ø)
hathor/event/resources/event.py	86.84% <100.00%> (+0.35%)	⬆️
hathor/event/storage/event_storage.py	100.00% <100.00%> (ø)
hathor/event/storage/memory_storage.py	100.00% <100.00%> (ø)
hathor/event/storage/rocksdb_storage.py	91.22% <100.00%> (ø)
hathor/event/websocket/factory.py	92.45% <100.00%> (ø)
hathor/event/websocket/response.py	100.00% <100.00%> (ø)
... and 2 more

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