Add analytics

[garrytrinder]

To understand the usage of different features in toolkit we should consider adding some level of analytics, for example, we provide code lens on plugin instances for users to navigate to docs, however we don't know if users follow these links.

[garrytrinder]

A few options:

• Integrate Clarity which we currently use for devproxy.net
• Add query string params to external links to docs and use analytics reporting to understand if these links are being followed in the toolkit, ?wt.mc_id=devproxytoolkit