Memory usage stats in C API #4340
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Please consider this small PR providing access to the
MemoryUsage::GetApproximateMemoryUsageByTypefunction in plain C API. Actually I'm working on Go application and now trying to investigate the reasons of high memory consumption (#4313). Go wrappers are built on the top of Rocksdb C API. According to the #706,MemoryUsage::GetApproximateMemoryUsageByTypeis considered as the best option to get database internal memory usage stats, but it wasn't supported in C API yet.