Measure and report code coverage

[ggonzalez94]

templates

• Generic Runtime Template
• Evm Template

What is the feature you would like to see?

We should be measuring code coverage and reporting it to CodeCov. The best tool to do this is cargo-llvm-cov since it generates very precise coverage data.
One thing we need to solve is that we don't have a workspace that wraps the two templates, so we need:
a) Create a workspace and share dependencies
b) Or find a way to report coverage to two different codecov projects

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