Better, faster,stronger version 2.0

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The current version 3df3480 corresponds to the WebConference'25 accepted version of the paper.

A version 2.0 is being prepared in the backstage featuring :

• parallelism, related to issue Parallelizing root scan #13
• new operators, such as the ones related to issues Implement a basic SERVICE clause #19 and Make COUNT great again. #17
• better configuration
•  more ?