Add an API to receive partial responses if the caller wants them

[StylianosGakis]

This exposes the new
fun <D : Operation.Data> ApolloCall<D>.safeFlowAllowingPartialResponses(): Flow<Ior<ApolloOperationError, D>>
function singature, for future potential callers who are interested in partial data too.

On the call site, this would practically look something like this

val homeQueryData: HomeQuery.Data = when (homeQueryDataResult) {
  is Both<ApolloOperationError, HomeQuery.Data> -> {
    logcat(WARN) {
      "HomeQuery() responded with a partial result. ApolloOperationError:${homeQueryDataResult.leftValue}"
    }
    homeQueryDataResult.rightValue
  }

  is Left<ApolloOperationError> -> raise(homeQueryDataResult.value)
  is Right<HomeQuery.Data> -> homeQueryDataResult.value
}

so we can move forward with partial data if it's there, and raise/log appropriately