Add support for developing in VS Code

Summary

The JUnit tests can be run and debugged interactively in VS Code with the following settings (in .vscode/settings.json):

{
    "java.test.config": {
        "env": {
            "MAVEN_DEBUG_OPTS": "-Xdebug -Xnoagent -Djava.compiler=NONE -Dcaosdb.debug=true -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=0.0.0.0:9000"
        },
        "args": ["-X"]
    },
}

This could be added to the repository.

Expected Behavior

Would be nice to able to run and debug tests inside VS Code

Actual Behavior

Tests all fail out of the box due to missing env variables.

Specifications

• Version: Which version of this software?
• Platform: any with VS Code

Possible fixes

See above