selftests/bpf: libarena: Add a benchmark for malloc()/calloc()

Add a benchmark for measuring the performance of the malloc()/calloc()
arena allocator calls. This is useful as a basic allocator performance
check that we can easily expand later. As with the regular arena
allocator, focus on sub-page allocations that cannot be satisfied
efficiently with the BPF arena page allocation code.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260817191616.11071-6-emil@etsalapatis.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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