[SDTEST-160] Implement code coverage metrics for internal telemetry #203
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What does this PR do?
Adds code coverage metrics to internal telemetry.
Additional Notes
Note that code_coverage.errors metric is unused and remove. Code coverage collection in this library is "error-free" as any potential fatal bug in native extension will most likely cause segfault and crash of the Ruby process.
How to test the change?
Unit tests are provided