Expose CoverageReport through EmulatorGateway

[m-Peter]

Work towards: onflow/developer-grants#132
Depends on: onflow/flow-emulator#362

Description

This will allow tools that build on-top of the Flow Emulator through the Flow CLI, to be able to inject/retrieve the CoverageReport object.
Context: bjartek/overflow#107

---

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[m-Peter]

cc @bjartek

[sideninja]

Awesome, thank you

[bjartek]

Amazing!

[codecov-commenter]

Codecov Report

Merging #995 (ca0fce8) into master (a3dd185) will increase coverage by 35.84%.
The diff coverage is 56.75%.

@@             Coverage Diff             @@
##           master     #995       +/-   ##
===========================================
+ Coverage    2.49%   38.34%   +35.84%     
===========================================
  Files           5       37       +32     
  Lines         441     1836     +1395     
===========================================
+ Hits           11      704      +693     
- Misses        429     1050      +621     
- Partials        1       82       +81     

Flag	Coverage Δ
unittests	38.34% <56.75%> (+35.84%)	⬆️

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

Impacted Files	Coverage Δ
internal/accounts/create-interactive.go	0.00% <0.00%> (ø)
internal/accounts/staking-info.go	0.00% <0.00%> (ø)
internal/keys/generate.go	16.00% <0.00%> (ø)
internal/super/dev.go	0.00% <0.00%> (ø)
internal/super/files.go	12.35% <ø> (ø)
internal/super/output.go	0.00% <0.00%> (ø)
internal/super/project.go	0.00% <0.00%> (ø)
internal/super/setup.go	0.00% <0.00%> (ø)
internal/transactions/sign.go	37.50% <21.42%> (ø)
internal/signatures/verify.go	47.91% <50.00%> (ø)
... and 26 more

... and 1 file with indirect coverage changes

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