Add new event taskinprogress

[JeffersonGibin]

Why was this implemented?

This was implemented to make it possible to identify a task that is in progress. Currently, it is possible to identify an error and also if a task has been added to the queue. However, in situations where it is necessary to manage the 'progress' of tasks for database management, for example, it becomes somewhat complex.

How does it work?

cluster.on("taskinprogress", (data, isCallbackExecution) => {
    if (isCallbackExecution) {
        console.log("A callback is in progress", data);
    } else {
        console.log("A task is in progress and it is not a callback", data);
    }
});

Tests

• A test similar to the event queue test has been implemented.

Readme

• The file README.md was updated

Missing

• CONTRIBUTING.md don't contains version and date release.
• The package-json don't contain this version.