Run benchmarks against APCu and Relay\Table

[yatsukhnenko]

See https://github.com/cachewerk/relay-core/issues/1202

php run --warmup 0 --workers 1 --filter RelayTable\|APCu BenchmarkGet.php 
Setting up on AMD Ryzen 7 4700U with Radeon Graphics (8 cores/8 threads x86_64)
Using PHP 8.3.27 (OPcache: Off, Xdebug: Off, New Relic: Off)
Connected to Redis (8.2.2) at tcp://127.0.0.1:6379


 GET  Executing 5 iterations (0 warmup) for 1.00s seconds

+------------+--------+---------+---------+--------+-------------+--------+--------+--------+
| Client     | Memory | Network | Workers | IOPS   | IOPS/Worker | rstdev | Change | Factor |
+------------+--------+---------+---------+--------+-------------+--------+--------+--------+
| APCu       | 1.41mb |    181b |       1 | 13.01M |      13.01M | ±0.28% |  0.00% |  1.00x |
| RelayTable | 1.41mb |    181b |       1 | 21.01M |      21.01M | ±1.80% | 61.49% |  1.61x |
+------------+--------+---------+---------+--------+-------------+--------+--------+--------+

[tillkruss]

@yatsukhnenko can we move this into a dedicated case/scenario, feels wrong to merge this with GET.

[tillkruss]

tests and linters are failing.

[tillkruss]

Let's NOT run these by default.

But add a README entry on how to run them.