Allow multiple calls at the same time

[hopperelec]

It's usually safe to assume that a call cannot be started when the last one hasn't ended yet, but this doesn't work if importing multiple chats. I could be in a call with someone but receive a call from someone else, or I could be in two group chats which happened to have an active call at the same time.

[github-actions[bot]]

⚡ Preview for this PR: https://pr-94.chat-analytics.pages.dev 📊 Demo

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Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (33696f2) 71.96% compared to head (3d7a8af) 71.90%.

Files	Patch %	Lines
pipeline/aggregate/blocks/calls/CallsStats.ts	0.00%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #94 +/- ## ========================================== - Coverage 71.96% 71.90% -0.06% ========================================== Files 60 60 Lines 2440 2442 +2 Branches 513 513 ========================================== Hits 1756 1756 - Misses 624 626 +2 Partials 60 60 ```

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[mlomb]

You are right, but I think the sign is flipped. We want to ignore the overlap time, so we have to subtract the difference (since this line secondsInCall += call.duration will count the overlap twice)

[hopperelec]

Yes, you want to take off the absolute difference if the difference is negative, but since the difference is negative (hence the if (diff < 0) {) this actually means adding it.

For example, if the second call is 10 seconds before the first one, then diff could be -10 and we want to take off the 10 seconds in between. If we do secondsInCall -= -10, we actually add 10

[mlomb]

You are right, my bad. Fixed in https://github.com/mlomb/chat-analytics/commit/6b1be2b6e1cd93242f5568d859bdd4f6ef575d82