algo: Optimize host code in GPU Hitfinder.

Introduces three optimizations to the host code of the STS Hitfinder:

• Allocate all buffers beforehand on GPU, do dynamic allocation per TS on CPU (allocating the pinned memory for GPU is very slow)
• Speedup sorting Digis by module by using a lookup table to map the sensor address to an index and parallelizing the copy
• Copy hits to pinned memory to speed up copy from the GPU