flush forcefully sends events regardless the delay

[marandaneto]

💡 Motivation and Context

https://github.com/postHog/posthog-js-lite/ sends events regardless the timer if flush is called manually.

https://posthog.com/questions/flush-interval-seconds-not-working

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[benjackwhite]

I can't tell from the PR alone but I can at least clarify how it works elsewhere:

1. By default events are queued and are only flushed as a batch once a timer passes or the size threshold is hit.
2. However, a user can manually call the flush function to force whatever is in the buffer to be flushed.

If this code achieves that then 👍

[pauldambra]

🚢

[marandaneto]

I can't tell from the PR alone but I can at least clarify how it works elsewhere:

1. By default events are queued and are only flushed as a batch once a timer passes or the size threshold is hit.
2. However, a user can manually call the flush function to force whatever is in the buffer to be flushed.

If this code achieves that then 👍

1. not really, since its an and operation, the timer passes and the threshold hits.
2. yes, this PR addresses this use case.

[marandaneto]

I can't tell from the PR alone but I can at least clarify how it works elsewhere:

1. By default events are queued and are only flushed as a batch once a timer passes or the size threshold is hit.
2. However, a user can manually call the flush function to force whatever is in the buffer to be flushed.

If this code achieves that then 👍

1. not really, since its an and operation, the timer passes and the threshold hits.
2. yes, this PR addresses this use case.

made new commits that address the 1. item, if this ever becomes a battery-draining issue, we can revert this part since its super simple.