Handle DateTime serializing (Fixes #378)

[stephen-murby]

Add handling for parsing date and time objects when serialising a Map<K,V> to a JSON String.

[snowplowcla]

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[stephen-murby]

All done and signed :)

On Wed, Feb 7, 2024 at 9:41 AM Snowplow CLA bot @.***> wrote:

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).

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[snowplowcla]

Confirmed! @stephen-murby has signed the Contributor License Agreement. Thanks so much.

[matus-tomlein]

Thanks a lot for the contribution @stephen-murby! We will review and release this in the next version of the tracker.