Add a standardized benchmark command speedtest.

`speedtest [threads] [hash_MiB] [time_s]`. `threads` default to system concurrency. `hash_MiB` defaults to `threads*128`. `time_s` defaults to 150.

Intended to be used with default parameters, as a stable hardware benchmark.

Example:
```
C:\dev\stockfish-master\src>stockfish.exe speedtest
Stockfish dev-20240928-nogit by the Stockfish developers (see AUTHORS file)
info string Using 16 threads
Warmup position 3/3
Position 258/258
===========================
Version                    : Stockfish dev-20240928-nogit
Compiled by                : g++ (GNUC) 13.2.0 on MinGW64
Compilation architecture   : x86-64-vnni256
Compilation settings       : 64bit VNNI BMI2 AVX2 SSE41 SSSE3 SSE2 POPCNT
Compiler __VERSION__ macro : 13.2.0
Large pages                : yes
User invocation            : speedtest
Filled invocation          : speedtest 16 2048 150
Available processors       : 0-15
Thread count               : 16
Thread binding             : none
TT size [MiB]              : 2048
Hash max, avg [per mille]  :
    single search          : 40, 21
    single game            : 631, 428
Total nodes searched       : 2099917842
Total search time [s]      : 153.937
Nodes/second               : 13641410
```

-------------------------------

Small unrelated tweaks:
 - Network verification output is now handled as a callback.
 - TT hashfull queries allow specifying maximum entry age.

closes https://github.com/official-stockfish/Stockfish/pull/5354

No functional change

src/benchmark.h

@@ -27,6 +27,16 @@ namespace Stockfish::Benchmark {
 
 std::vector<std::string> setup_bench(const std::string&, std::istream&);
 
+struct BenchmarkSetup {
+    int                      ttSize;
+    int                      threads;
+    std::vector<std::string> commands;
+    std::string              originalInvocation;
+    std::string              filledInvocation;
+};
+
+BenchmarkSetup setup_benchmark(std::istream&);
+
 }  // namespace Stockfish
 
 #endif  // #ifndef BENCHMARK_H_INCLUDED