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MVT: Improve performance and memory usage
- Reduce memory usage (raises protobuf-c requirement to 1.1). - Improves performance when merging tiles (from parallel queries). - Uses protobuf values to reduce the number of transformations and memory usage. - Uses a temporal context when transforming data (reading rows) to have a fast way of cleaning up memory before the parallel process starts. - Processes texts and cstrings with each known reading functions instead of the `OidOutputFunctionCall` fallback. - Avoids multiple hash function calls when a value is not found in the hash table (once for the lookup and once for the insertion). Closes #576 Closes #4737
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