Move @types/async-eventemitter from devDependencis to dependencies

[ScottyPoi]

VM / EVM

From tracking issue #2032

evm:

@types/async-eventemitter is listed as devDependency: this should be a dependency, otherwise consumers cannot access the on property of EVM.

vm:

 @types/async-eventemitter is listed as devDependency: this should be a dependency, otherwise consumers cannot access the on property of VM.

[codecov]

Codecov Report

Merging #2077 (3dff1c6) into master (c1a319f) will increase coverage by 0.40%.
The diff coverage is n/a.

Flag	Coverage Δ
block	83.75% <ø> (ø)
blockchain	80.10% <ø> (ø)
client	78.30% <ø> (ø)
common	95.00% <ø> (ø)
devp2p	82.66% <ø> (+0.12%)	⬆️
ethash	90.81% <ø> (ø)
evm	40.89% <ø> (ø)
statemanager	84.55% <ø> (ø)
trie	82.52% <ø> (+1.69%)	⬆️
tx	92.18% <ø> (ø)
util	87.22% <ø> (ø)
vm	78.51% <ø> (?)

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[jochem-brouwer]

Thanks!