Compute event hashes in separate thread [Verifiable events part 4]

[m4ksio]

As noted in previous PR, computing hashes can be CPU intensive, hence similar approach as with block commitments - separate comiter whish shouldn't block execution of further collections

[yhassanzadeh13]

LGTM

[yhassanzadeh13]

Does it make sense to make the eventHasher a ReadyDoneAware implementation?

flow-go/module/common.go

Lines 3 to 7 in f861f31

	// ReadyDoneAware provides easy interface to wait for module startup and shutdown
	type ReadyDoneAware interface {
	Ready() <-chan struct{}
	Done() <-chan struct{}
	}

[ramtinms]

👏

[codecov-commenter]

Codecov Report

Merging #868 (02d52c7) into master (9b26087) will decrease coverage by 0.01%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #868      +/-   ##
==========================================
- Coverage   56.89%   56.87%   -0.02%     
==========================================
  Files         429      429              
  Lines       25635    25652      +17     
==========================================
+ Hits        14584    14589       +5     
- Misses       9079     9086       +7     
- Partials     1972     1977       +5     

Flag	Coverage Δ
unittests	56.87% <90.90%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
engine/execution/messages.go	100.00% <ø> (ø)
model/flow/event.go	73.68% <ø> (ø)
engine/execution/computation/computer/computer.go	87.19% <90.00%> (+0.23%)	⬆️
engine/execution/ingestion/engine.go	55.02% <100.00%> (-1.31%)	⬇️
module/chunks/chunkVerifier.go	65.34% <100.00%> (ø)
engine/verification/match/chunks.go	83.33% <0.00%> (-6.67%)	⬇️
engine/verification/match/engine.go	65.10% <0.00%> (-1.08%)	⬇️
cmd/util/ledger/migrations/storage_v4.go	42.16% <0.00%> (+0.60%)	⬆️

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