adds AVL predecessor and successor functions

adds const qualifiers to compare, distance and copy function signatures

adds distance function and ucx_avl_find_node()

safe one multiplication in overflow check for mempool_chcap()

removes unused ucx_mempool_clamp() and changes storage behavior of mempool to increase the capacity by a factor of two

ucx_mempool_free() aborts execution instead of just exiting on failure

fixes integer overflow in ucx_buffer_extract

fixes major bug in construction of KMP prefix table for strstr()

further performance tweaks to sstrstr() function

improves sstrstr function by using KMP string search algorithm

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