test(coverage): setup coverage for TS packages

[ctrlc03]

Description

setup code coverage for TS packages using istanbul (nyc)

Related issue(s)

fix #931

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[kittybest]

Will we also add nyc to circuits package? I think we're also using mocha to run tests in that package.
Also will we use another tool to test the code coverage for smart contracts? I think there are some packages such as solidity-coverage.

[ctrlc03]

Will we also add nyc to circuits package? I think we're also using mocha to run tests in that package.

Also will we use another tool to test the code coverage for smart contracts? I think there are some packages such as solidity-coverage.

For the circuits package, it depends if we want to add unit tests for the ts code that is there (might be worth doing). If it's just for the circuits, then I'm afraid it wont really work with circom code, and I don't really know of any coverage tool for circom code unfortunately, we should do some research there.

Yes for contract there's that one, tho I tried to set it up and was having some issues with contract size due to the tool bloating contracts for collecting coverage, so I thought it would be best if we were to tackle that in a separate PR