fix: flush interval flushes only if the threshold is met

[marandaneto]

Changes

https://posthog.com/questions/flush-interval-seconds-not-working
Also PostHog/posthog-android#73

the flush interval only flushes events only if the threshold (flushAt) is met to avoid high battery consumption.
if the flush interval flushes events regardless of the total of events, every 30s, most likely the batch operation won't be that useful since you don't capture many events every 30s, so it's better to wait for the threshold (flushAt) instead.
The alternative is to call flush, in this case, events are sent right away, the fix for that is here.

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[pauldambra]

🚢

[marandaneto]

Closed in favor of PostHog/posthog-android#73
the SDK meets the description in the current form