Add scripts to analyze project test coverage

[denischilik]

Summary

• This PR contains two script files check_coverage.sh and check_coverage.py to build project coverage report
• To build report you can run check_coverage.sh from build folder.
• check_coverage.py contains COVERAGE_THRESHOLD which is used to highlight files with red if coverage less the threshold.
• Script doesn't display files which have 100% coverage

Testing Plan

• [*] Was this tested locally? If not, explain why.
• to check project test coverage you can run check_coverage.sh from build folder.

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://mparticle-eng.atlassian.net/browse/SQDSDKS-7484