feat(events): reset event queue command

[glevco]

Acceptance Criteria

• Implement --x-reset-event-queue CLI flag to reset the event queue, allowing the start of a full node without the event feature after it was previously enabled
• Implement ability to reset all EventStorage data
• Fix support for merged mining block

Closes #580

[codecov]

Codecov Report

Merging #608 (cbda38b) into master (d7508e0) will increase coverage by 0.00%.
The diff coverage is 81.81%.

@@           Coverage Diff           @@
##           master     #608   +/-   ##
=======================================
  Coverage   83.63%   83.64%           
=======================================
  Files         232      232           
  Lines       19826    19835    +9     
  Branches     2714     2714           
=======================================
+ Hits        16582    16591    +9     
  Misses       2644     2644           
  Partials      600      600           

Impacted Files	Coverage Δ
hathor/manager.py	70.60% <0.00%> (-0.05%)	⬇️
hathor/builder/cli_builder.py	70.27% <40.00%> (-0.16%)	⬇️
hathor/event/event_manager.py	90.74% <100.00%> (ø)
hathor/event/model/event_data.py	100.00% <100.00%> (ø)
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	94.18% <100.00%> (+0.28%)	⬆️

... and 2 files with indirect coverage changes