[FEATURE] Add column sums or reporting header for datasources

[global-H]

Counting the number of devices, datasources (as each device may have more than one datasource, e.g. "hids" and "wineventlog") is quite labour-intensive, requiring a time-consuming and error-prone manual count.

Ideally, the page could have a report header or footer with:

• Sum of devices listed

• Sum of devices "All Connected"

• Sum of devices "Disabled or Partially Connected" (i.e. only one of two datasource integrations active)

• Sum of total datasources up

• Sums of datasources by integration type ("nids", "hids", "O365" etc).

• Sums of datasources not reporting

This would provide a quick overview of the datasource health and avoid the lengthy process of scrolling through pages and pages just to get a basic overview.