add metrics on call event

[mcalinghee]

Cas d'usage

• Scenario 1 : appel de user A vers user B - user A doit envoyer un event CallStarted lors de l'emission d'un appel (au démarrage de l'appel)
• Scenario 2 : appel de user A vers user B - user B doit envoyer un event CallStarted lors de la réception et acceptation d'un appel (au démarrage de l'appel)
• Scenario 3 : appel de user A vers user B - user A doit envoyer un event CallEnded lors de la fin d'appel lorsque user A termine l'appel
• Scenario 4 : appel de user A vers user B - user B doit envoyer un event CallEnded lors de la fin d'appel lorsque user A termine l'appel

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• Sign-off given on the changes (see CONTRIBUTING.md).

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
13361669	Triggered	Generic High Entropy Secret	406b9af	config.dev.json	View secret

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1. Revoke and rotate the secret.

2. If possible, rewrite git history with git commit --amend and git push --force.

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[NicolasBuquet]

LGTM!

[mcalinghee]

J'ai mis la cle comme chez element-web ou android en attendant d'avoir une infra de dev