Update firebase mappings to improve performance on large surveys - #3868
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Towards #3866
Loading large surveys could be very slow. One of the factors was using expensive java reflection lookups on every field of every LOI as well as storing unused properties that could be very large (especially if whisp integration is enabled on the survey). This PR optimizes that:
LoiGeometryConverterto read geometry directly from the Firestore document instead of through the reflection-based proto mapperAfter testing with some user surveys from Vietnam, these changes were shown to cut in half the time needed to download
@shobhitagarwal1612 PTAL?