Add support for querying Matomo for country data and charts

[mjordan]

I can break these out into separate issues if that's preferable, but I'd like to propose that we add queries that will fetch, for a given URL, country data (that is, country of the client) and Matomo's pregenerated charts.

Here's a sample query that returns country data:

curl -v http://localhost:8000/matomo/index.php?module=API&method=UserCountry.getCountry&idSite=1&period=range&date=2000-01-01,2020-09-02&format=JSON&token_auth=7165b664aadfcf9d95532cb6e0879275&segment=pageUrl==http%3A%2F%2Flocalhost%3A8000%2Fnode%2F10

Here's a sample query that returns a chart, in this case showing the hits during the last 30 days:

curl -v -o chart.png "http://localhost:8000/matomo/index.php?module=API&apiModule=Actions&apiAction=get&method=ImageGraph.get&graphType=evolution&idSite=1&period=day&date=previous30&width=500&height=250&token_auth=7165b664aadfcf9d95532cb6e0879275&segment=pageUrl==http%3A%2F%2Flocalhost%3A8000%2Fnode%2F10"

Here's a sample chart returned by this query:

I am happy to work on this.

[wgilling]

@mjordan, I am also happy to collaborate on this important feature. I think that all of the code handling would be in src/IslandoraMatomoService.php and src/IslandoraMatomoServiceInterface.php.

Should this issue also require a block related to each report type or would these new methods be called from islandora_repository_reports? I could see blocks that have settings that would allow it to be configured to a given country (should this always be the user's current Country?) and optionally filtered by the underlying node.