sol-cov: suggested performance improvement.

[drortirosh]

Expected Behavior

Current Behavior

sol-coverage is currently very slow to run: it is required to re-execute each transaction in debug in order to collect coverage data.

Tests that normally takes ~200ms to run nows over 1-2 seconds when collecting coverage data.
While its OK for periodically coverage runs, it prevents from adding the coverage results added to every unit-test running.

Possible Solution

Instead of re-submitting the transcation, a hook can be added into ganache, to report ALL EVM instruction addresses.
This means a normal (test) run is executed, and in parallel, coverage data is collected.
Then, after the run is complete, a single run of the "instanbul" reporting tool will genreate the text/html report.

[stale]

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