Speakers company/geolocation/job title stats & fix dev log error for rerender

[HugoGresse]

1. Add a speakers statistics dialog that aggregates data by companies, job titles, and geolocations. Closing #88
2. Resolve development errors related to unnecessary rerendering.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e76310c):

• https://conferencecenterr--pr90-speakers-company-sta-foi1duzs.web.app
• https://apiopenplanner--pr90-speakers-company-sta-8tu7k2ds.web.app

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