Github Coverage tracking report implementation for test coverage

[dwdraju]

Overview

coveralls.io implementation and integration with Github Actions for tracking test coverage of icon-bridge repo.

Coveralls links

Language integration and libraries to use for submitting coverage report(docs.coveralls.io:

1. Java: https://github.com/trautonen/coveralls-maven-plugin
2. Solidity smart contracts: https://medium.com/edgefund/testing-and-code-coverage-of-solidity-smart-contracts-660cb6291701
3. Javascript: https://docs.coveralls.io/javascript

Acceptance Criteria

1. Github actions to trigger coverage tracking and send report to coveralls
2. Github repo integration so that report(percentage coverage) is seen from github repo without landing on coveralls dashboard

[andrii-kl]

Looks good, just keep in mind that in java case we are using gradle. So the maven plugin can not working.

[dwdraju]

We decided to go codecov because of it's support for monorepo like, test coverage show inside executed folder.

[dwdraju]

Example coverage reports on github side after implementation(integrated on private repo - will go to icon-bridge after repo gets public)

[dwdraju]

The coverage report of solidity is not actual on the codecov dashboard. Probable reason is like this issue sc-forks/solidity-coverage#715
@sdpisreddevil