Add some statistical reports

[scysys]

First, this is an absolutely great enhancement to Matomo!

As I can say at this moment, I don't have any Problems with the Tag Manager.

What I missing are some statistical reports like:

• tag loads
• tag loads over the past x days

and so on.

[scysys]

I don´t see there is already the same question: https://github.com/matomo-org/tag-manager/issues/3

[tsteur]

I'll close it in favor of #3