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perf: add memtx benchmark

This first version is quite basic and only benchmarks random `get`s of
existing keys and `select`s of all keys for a tree index (these benchmarks
are needed for #6964) — its main goal is to provide a foundation (i.e., all
the necessary initialization logic) for benchmarking memtx. Extending this
benchmark using the provided memtx singleton and fixture should be fairly
simple.

The results of running this benchmark compiled with clang-16 on my Intel
MacBook Pro (13-inch, 2020) laptop [1]:

NO_WRAP
georgiy.lebedev@georgiy-lebedev perf % ./memtx.perftest --benchmark_min_warmup_time=10 --benchmark_repetitions=10 --benchmark_report_aggregates_only=true --benchmark_display_aggregates_only=true
2023-10-02T12:59:36+03:00
Running ./memtx.perftest
Run on (8 X 2000 MHz CPU s)
CPU Caches:
  L1 Data 48 KiB
  L1 Instruction 32 KiB
  L2 Unified 512 KiB (x4)
  L3 Unified 6144 KiB
Load Average: 5.67, 10.05, 7.89
mapping 4398046511104 bytes for memtx tuple arena...
Actual slab_alloc_factor calculated on the basis of desired slab_alloc_factor = 1.090508
fiber has not yielded for more than 0.500 seconds
--------------------------------------------------------------------------------------------------------
Benchmark                                              Time             CPU   Iterations UserCounters...
--------------------------------------------------------------------------------------------------------
MemtxFixture/TreeGetRandomExistingKeys_mean          682 ns          667 ns           10 items_per_second=1.51504M/s
MemtxFixture/TreeGetRandomExistingKeys_median        704 ns          693 ns           10 items_per_second=1.44387M/s
MemtxFixture/TreeGetRandomExistingKeys_stddev       81.7 ns         72.7 ns           10 items_per_second=169.696k/s
MemtxFixture/TreeGetRandomExistingKeys_cv          11.97 %         10.90 %            10 items_per_second=11.20%
MemtxFixture/TreeGet1RandomExistingKey_mean          253 ns          241 ns   ... (continued)

64594 of 116322 branches covered (0.0%)

96578 of 111735 relevant lines covered (86.43%)

2672789.62 hits per line