Add Telemetry tracking so we can make better product decisions

[aaronrothschild]

• Count how many cloud vs server vs data center instances are auth'd with the plugin so we can figure out if we need to build out the cloud based plugin on Confluence.
• Count how many subscriptions rules are setup so we can figure out how much the plugin is used.
• Count how many notifications the plugin has processed/posted so we have a general idea of how much usage the plugin is getting.

As always, do not collect any PII nor data that may be sensitive. These are just 'counts" of usage, so shouldn't be a problem.

@jfrerich Let's consider adding this before release.