Add loads_next function #619
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The new function
loads_next()deserializes the next JSON document from a buffer and returns a tuple of(parsed_object, bytes_consumed). This allows users to implement JSONL/NDJSON in userspace (#204, #428, #536); and an example of how can be found in the test suite.Stacked on #618, so as to avoid implementing the deserializer changes for the unused backend.