feat(events): CLI tool for testing event integration

[glevco]

Acceptance Criteria:

• Implement new events_simulator CLI command to enable a dummy stream of events to a WebSocket endpoint, simulating real scenarios
  • Option --scenario to choose the scenario between SINGLE_CHAIN, BEST_CHAIN_WITH_SIDE_CHAINS, and MULTIPLE_FORKS
  • Option --port to chose the WebSocket server port
• Actual list of dummy events for each scenario not implemented yet.*

*That's as simple as setting the list of BaseEvents for each scenario in the scenario.py file. This will be done in a separate PR after pending design discussions and definition of which events should be emitted in each case. Creating this list should be almost a 1:1 conversion from the list of events that will be specified in the design.

[codecov]

Codecov Report

Merging #539 (e74f8ff) into dev (efe6f7d) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #539      +/-   ##
==========================================
- Coverage   83.20%   83.19%   -0.01%     
==========================================
  Files         211      211              
  Lines       18644    18644              
  Branches     2590     2590              
==========================================
- Hits        15512    15511       -1     
- Misses       2562     2563       +1     
  Partials      570      570              

see 2 files with indirect coverage changes

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