Adding support for multiple-entities in one request

[kopiro]

Feel free to close this PR if you don't see the need, but there are some scenarios when a request contains multiple events, and you wanna visualize them separately in the panel.

This was exactly my need, therefore I added the support for this and thought that maybe could be valuable for you to consider this.

The implementation is simple, if parseUrls returns an array, we send multiple messages to the panel and treat them as fake-multiple requests. To avoid that this request is flagged as "redirect", I've also added a flag that should visualize this in the panel.

A simple implementation for a Provider would be this:

parseUrl(rawUrl, postDataStr) {
        let url = new URL(rawUrl);
        const postData = JSON.parse(postDataStr);
        return postData.events.map(event => {
            const data = this.parseEvent(url, event);
            return {
                "provider": {
                    "name":    this.name,
                    "key":     this.key,
                    "type":    this.type,
                    "columns": this.columnMapping,
                    "groups":  this.groups
                },
                "data": data
            };
        });
    }

[coveralls]

Coverage remained the same at 90.038% when pulling 55cc0e3 on kopiro:multiple-entries-per-request into 1387da6 on MisterPhilip:master.

[MisterPhilip]

This is great, thanks! I've been trying to figure out good ways to display this since it can be misleading either way. Let me review and let you know if there are any issues!

[marcusrbrown]

Hi, wanted to leave a gentle ping here. We also have a need for this feature.

[MisterPhilip]

Sorry, I've been out taking a mental break from Omnibug the past few months. I'll be looking at merging this in this month, stay tuned!

[MisterPhilip]

Thanks for the PR! It'll take some time for this to fully kick in since each of the applicable providers will need to be updated, but this is a great building block for me to work off of.