Feature: Improve support for multiple hostname sharing same website ID

[KieranP]

Describe the feature or enhancement

Use case: I have one app deployed across many subdomains. I want to track data together (to see overall popular pages, etc) by using the same website id, but still be able to see metrics per hostname. The filters support filtering by hostname, which is very helpful. The following changes would also help improve this type of usage:

1. On the website overview page, there are lists for top pages, referrers, browsers, etc. When a website has multiple hostname events, it would be nice to have another section on dashboard for top hostnames, to see which client is getting most traffic. I know I can click on "More" on any of the other ones and then click "Hosts", but it is another couple of clicks (eventually it would be nice if overview allowed us to select which metrics to show, but I understand that would be a much bigger change)

2. On the website events page or website realtime page, when a website has multiple hosts, it would be nice to see the host on the host line, something like this:

3. On the website sessions page, a column for hostname (like 1, eventually would be nice to select which columns to show)

[sagararyal]

@KieranP I came across this issue as well.

It can be further expanded to support grouping by hostnames on pages tab. (Maybe a condition needs to be added for people who use both www, and root)