feat: Add junit module

[jan-goral]

Fixes #1827

• The JUnit structures are bases on those taken from the test_runner but applying some fixes like reducing the number of nullable fields.
• The JUnit.xsd is added just for convenience as a referential scheme.

Test Plan

How do we know the code works?

Unit tests pass

Checklist

• Documented
• Unit tested

[github-actions]

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[github-actions]

Timestamp: 2021-05-12 13:09:00
Buildscan url for ubuntu-workflow run 835538561
https://gradle.com/s/wgfldntk4e2zy

[mergify]

Title does not follow the guidelines of Conventional Commits.
Please adjust title before merge and use one of following prefix:

• build - Changes that affect the build system or external dependencies (dependencies update)
• ci - Changes to our CI configuration files and scripts (basically directory .github/workflows)
• docs - Documentation only changes
• feat - A new feature
• fix - A bug fix
• chore - Changes which does not touch the code (ex. manual update of release notes). It will not generate release notes changes
• refactor - A code change that contains refactor
• style - Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• test - Adding missing tests or correcting existing tests and also changes for our test app
• perf - A code change that improves performance (I do not think we will use it)