Port RNW LocationObserverModule to react-native-community/geoLocation

Proposal: Port RNW LocationObserverModule to react-native-community/geoLocation

Summary

With the move to the 0.60 branch, navigator.geoLocation is no longer supported by react-native. It has been moved to react-native-community/geoLocation and deprecated from react-native. However, react-native-community/geoLocation doesn't support windows...yet. Our react-native-windows LocationObserver module is now 'orphaned'.

https://github.com/react-native-geolocation/react-native-geolocation

Motivation

In our UWP calendar app, the weather feature depended on navigator.geoLocation from react-native-windows. The weather feature is now broken.

Open Questions

In the interim, we might consider moving this support to react-native-windows-extended.

[kmelmon]

The right longer term solution is to add windows support to the community module, but we haven't fully setup the infra for linking them yet.

@KAnder425 for now we could add this into react-native-windows-extended. If you're blocked on this I suggest unblocking yourself by doing this. Let us know if you need more.

[kmelmon]

@chrisglein how are we tracking adding support to the top community modules? This should likely be on the list.

[chrisglein]

@stmoy is tracking the whole list, and we have a project board for them as well: https://github.com/microsoft/react-native-windows/projects/23
I've added it to the board.

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