Replace `eventEmitter` with a snail pretending to be a fast, modern event emitter

[acolytec3]

Replaces our use of native NodeJS event emitters with the emittery package.

All events are now async by default

Other notable changes

• Removed AsyncEventEmitter export from util
• Added types for common, blockchain, and devp2p events

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 6.27178% with 269 lines in your changes missing coverage. Please review.

Project coverage is 27.37%. Comparing base (4470cc3) to head (5ba1f69). Report is 112 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	67.57% <ø> (-5.89%)	:arrow_down:
blockchain	83.50% <40.00%> (?)
client	0.00% <0.00%> (ø)
common	89.85% <100.00%> (?)
devp2p	0.00% <0.00%> (?)
evm	65.17% <75.00%> (?)
genesis	0.00% <ø> (?)
mpt	52.06% <ø> (?)
statemanager	67.41% <ø> (?)
tx	76.70% <ø> (-1.08%)	:arrow_down:
util	73.46% <ø> (?)
vm	58.23% <100.00%> (?)
wallet	0.00% <ø> (ø)

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

[acolytec3]

Please don't close this yet. I need to reference for my various cleanup PRs

[acolytec3]

I've taken care of the mess. We can wish this nonsense goodbye.

[holgerd77]

🎉 😂 🙏