tarantool / tarantool / 11458797847

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box: export box_slab_info via C API

Added the new C function `box_slab_info` that returns information about
the memory state depending on the passed argument `box_slab_info_type`.
The same information is available in Lua via `box.slab.info()`.

Backported to 3.2.1 in the sake of TCS, which uses that function to
get information about the memory state during automatic selection of
the columns to delete when tarantool's memory runs out.

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(cherry picked from commit bd510bb5c)

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