added prefixsum planop
Adding Histogram for Radix Join

adds a histogram plan operation to calculate the occurrences per
value based on a hash and the number of significant bits.
added autojson for prefix_sum
Adding increment and atomic increment to FixedLengthVector
Removing debug statement
Adding Radix Cluster and Bug Fixes

Adding a radix clustering algorithm and fixing a small
bug in the histogram calculation. Updating the
tests to be more challenging.
added NestedLoopEquiJoin
adjusted radix join test and test tables to fit with TableEqualitytest
Adding 2nd pass for histogram calculatin
Adding 2nd Pass for Radix clustering, extended test and added json test
Checking for existing edges before SEGV
Radix Cluster no needs a CreateRadixTable before and parallelizes
Fixing bug in RadixCluster Parallelization and Merging of test cases
Improve Histogram and test case