AstroBWT 20-50% speedup

Skips hashes with large stage 2 size. Added configurable `astrobwt-max-size` parameter, default value is 550, min 400, max 1200, optimal value ranges from 500 to 600 depending on CPU.

- Intel CPUs get 20-25% speedup
- 1st- and 2nd-gen Ryzens get 30% speedup
- 3rd-gen Ryzens get up to 50% speedup

src/backend/cpu/CpuLaunchData.cpp

@@ -42,7 +42,8 @@ xmrig::CpuLaunchData::CpuLaunchData(const Miner *miner, const Algorithm &algorit
     priority(config.priority()),
     affinity(thread.affinity()),
     miner(miner),
-    intensity(std::min<uint32_t>(thread.intensity(), algorithm.maxIntensity()))
+    intensity(std::min<uint32_t>(thread.intensity(), algorithm.maxIntensity())),
+    astrobwtMaxSize(config.astrobwtMaxSize())
 {
 }