This commit adds the new matras_stat struct which is supposed to be passed to matras_create() for extent accounting. It's okay to pass the same struct to different matras allocators, in which case the statistics will be accumulated. Currently, matras_stat includes two counters: the total number of extents and the number of extents used by read views. We need this to implement read view statistics in Tarantool.
This commit adds the new matras_stat struct which is supposed to be passed to matras_create() for extent accounting. It's okay to pass the same struct to different matras allocators, in which case the statistics will be accumulated. Currently, matras_stat includes two counters: the total number of extents and the number of extents used by read views. We need this to implement read view statistics in Tarantool.
Needed for https://github.com/tarantool/tarantool-ee/issues/143
In Tarantool repository the submodule will be updated by https://github.com/tarantool/tarantool/pull/8482.