Added class to process quadtiles in parallel

Karsten Prehn requested to merge feature/parallel into main

Adds the outer structure to parallelizing the calculation of quad-tiles, i.e. break a list of quadkeys into chunks and distribute those to worker processes. In a next step, the actual quad-grid calculation then can be implemented in a dedicated worker class.

MR contains parallelization class module & test file.

\approve @ds @marius

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