Cross OS testing with GitHub actions

**Is your feature request related to a problem? Please describe.**
We need to test selected versions of MongoDB continuously across operating systems.

**Describe the solution you'd like**
We can take advantage of GitHub actions and their offer for open source projects.

**Describe alternatives you've considered**
There are other services that provide similar stuff like TravisCI

Start by reviewing the repository's current test setup and GitHub Actions documentation. Define a matrix for the selected MongoDB versions and operating systems, then verify that the project tests run successfully for every matrix entry.

Written by the indexing model from the issue text.