Request: Smaller library variant

[tipa]

I am currently using tz-lookup-net but the package and the underlying timezone data hasn't been updated for more than four years, therefore I looked for an alternative and found this project. Unfortunately, it appears like this package is much, much larger in size (over 3 MB vs ~100 KB), likely because the timezone boundaries are more precise.
3 MB is just too large for me to be using it in a mobile app (it would make up 10% of the total app size).

According to tz-lookup-oss (the repo on which tz-lookup-net is based on), they were also using timezone-boundary-builder as source for the timezone data - just like this package - but perhaps with some additional lossy compression, resulting in the much smaller package size.

It would be fantastic if this library could offer something similar. A "GeoTimeZone-Lite" variant that is 40x smaller than the current version would be worth the tradeoff for slightly less accuracy for me

[mattjohnsonpint]

This is essentially the same as being discussed in #56, but in the opposite direction.

Personally, I don't think the next size down would lead to useful results. ie, geohash level 4 is ≤ 39.1km X 19.5km in precsion.

There may be other ways to optimize the data size. I'd accept a PR, but I'm not particularly invested in doing the work myself at the moment.

[mattjohnsonpint]

I'll leave this open in case anyone wants to send a PR.

Another approach to consider would be to build data using one of the other variants of the source shapefiles. That could shave off a few kb.