chore: added example code for analytics package (#4393)

[mrtopsyt]

Ticket

Closes #4393 .

Reviewers

@hunterckx .

Changes

• Added example code to the analytics package
• Added a table with package structure to the readme

QA steps (optional)

Known Issues

• The example code is dependent upon code that is currently in open PRs (see chore: support request created analytics #4397). The commit hash in requirements.txt should be updated once these are merged
• With the addition of new events to the analytics package, the google sheets api limit of 60 calls per user per minute is met quickly. This should be pretty easy to resolve, and I added a comment with pointers to the relevant section of example code:

# Currently this example makes too many api queries, so it will fail. 
# This can be resolved by updating the package to use batch updating wherever possible for gspread-formatting
# and to add exception handling to other gspread calls so they retry after a certain amount of time.
# Ideally, it would be possible to reduce the number of api calls by batching all updates to the spreadsheet in one
# api call, but this does not appear to be possible with gspread
# See https://gspread-formatting.readthedocs.io/en/latest/#batch-mode-for-api-call-efficiency
# and https://developers.google.com/sheets/api/limits#exponential