Track usage for repository analytics feature in case its not already tracked

Documentation for the repository analytics feature is here: https://docs.gitlab.com/user/analytics/repository_analytics/.

Check if the feature already has instrumentation to track usage counts. If there is instrumentation to track usage of the feature, update the documentation with a new section that highlights the details of the metrics and events tracked.

If there is no instrumentation on the feature, add instrumentation to track key feature usage metrics/events using the internal events guide (https://docs.gitlab.com/development/internal_analytics/internal_event_instrumentation/)

I would like the events/metrics to help me derive the following insights -

• How many users clicked on the Repository analytics tab ( Monthly, weekly and daily counts)
• How long on an average do users stay on the Repository analytics page
• How many users click on the download raw data button?
• How many users use the filters on the page?

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