Flush events only when the buffer is full (close #827)

[danigutierrezayuso]

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[snowplowcla]

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[danigutierrezayuso]

Thanks for your pull request. Is this your first contribution to a Snowplow open source project? Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://docs.snowplowanalytics.com/docs/contributing/contributor-license-agreement/ to learn more and sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

I signed it!

[snowplowcla]

Confirmed! @danigutierrezayuso has signed the Contributor License Agreement. Thanks so much.

[matus-tomlein]

Thank you for the contribution @danigutierrezayuso! This is definitely a needed change, but if you don't mind, we'll keep this open for a while longer because we plan to review the emitter behaviour for v6 of the tracker and just want to get the full picture of what needs to change before we merge this in.

[matus-tomlein]

Thanks again for the contribution @danigutierrezayuso! I have cherry picked the commit into another PR #850 where we will review it along with some other changes in the emitter behaviour and get this out in the v6 release of the tracker!