Refactor NRT_Reallocate

[guilhermeleobas]

You can use malloc_usable_size for determining the size of the malloc-allocated buffer. It would be Linux specific function though, see https://stackoverflow.com/questions/1281686/determine-size-of-dynamically-allocated-memory-in-c for Windows and Mac equivalents. Recall, heavydb can be built on Linux as well as on Windows.

It would be preferable to keep the original realloc API. Could you create an issue about this and emit an (only-once) warning in define_NRT_Reallocate call about the current behavior with a reference to the issue?

Originally posted by @pearu in #531 (comment)

The Numba Runtime offers a memory reallocation function called NRT_Reallocate, which internally utilizes the realloc function. However, using this function in HeavyDB can lead to issues because realloc may free the old buffer while copying memory, resulting in a double-free corruption that the HeavyDB server will subsequently try to free.