save_kmz: support data in UTM

[Alex-Lewandowski]

Description of proposed changes

This addresses an issue causing improperly geocoded velocity kmz files from data in UTM. KML only natively supports WGS84, so I added code to convert the bounding box coordinates to WGS84 when necessary.

Reminders

• Fix Output KMZs not properly geocoded for time series in UTM #1211
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[yunjunz]

Looks good to me. Thank you @Alex-Lewandowski!

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