[Pfc] Implement URL CGI parameters for setting block-size and max number of blocks for prefetching on per file basis #2606
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In the context of WLCG Analysis Facilities it became clear that people want to experiment with different settings for block-size and prefetching. This PR adds the ability to configure ranges of acceptable values for those two parameters and then pass them to the cache via opaque url cgi parameters
pfc.blocksizeandpfc.prefetch.Configuration
E.g.:
Example usage: