Reuse types from Replicache?

[arv]

There are some types that are copied from Replicache. For example:

https://github.com/Braden1996/react-native-replicache/blob/a7b37b49ea4199e58f4262d83c19da17f2f6867b/packages/deep-freeze/src/json-value.ts#L2

This should be able to use the exported types directly to prevent copy/paste but also to ensure same semantics.