Use examples under the examples folder for integration testing

[ekarademir]

There are now few examples under the examples folder, which have been created after bug report #17

Now they are created, we should use these and, future examples for running integration tests against a matrix of different mongo server versions, and maybe different operating systems.

We can make use of GitHub Actions

Acceptance criteria

• There is a shell script for running examples as integration tests
• There is a GitHub Action for running the tests against at least the latest version of mongo and ubuntu-18.04
• Optional: GH Action also includes testing against reasonable versions of mongo server, maybe latest from 3.x version and one from 4.x version
• Optional: GH Action also includes macos and windows server