Add widget for "Movers and Shakers"

[brotkrueml]

Is your feature request related to a problem? Please describe.

Users would like to be able to see which pages currently are visited the most.

Describe the solution you'd like

Something like:
Dashboard > "Movers and Shakers"

Additional context

The feature request is moved from #47 as a separate issue.

[brotkrueml]

Regarding the "Movers and Shakers": An example API call is:

?module=API&method=Insights.getMoversAndShakersOverview&idSite=1&period=month&date=today&format=JSON&token_auth=<token>&language=en

See: https://developer.matomo.org/api-reference/reporting-api#Insights

[brotkrueml]

Postponed: Currently, I do not get results when querying the movers and shakers via API for the current year:
https://demo.matomo.cloud/?module=API&method=Insights.getMoversAndShakersOverview&idSite=1&period=year&date=today&format=JSON&token_auth=anonymous&language=en

Result:

{
  "Page URLs": [],
  "Page titles": [],
  "Downloads": [],
  "Websites": [],
  "Social Networks": [],
  "Search Engines": [],
  "Country": [],
  "Campaign Names": []
}

[brotkrueml]

Postponed: Currently, I do not get results when querying the movers and shakers via API for the current year (so hard to test): https://demo.matomo.cloud/?module=API&method=Insights.getMoversAndShakersOverview&idSite=1&period=year&date=today&format=JSON&token_auth=anonymous&language=en

Result:

{
  "Page URLs": [],
  "Page titles": [],
  "Downloads": [],
  "Websites": [],
  "Social Networks": [],
  "Search Engines": [],
  "Country": [],
  "Campaign Names": []
}